content/browser/gpu/gpu_data_manager_impl

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
GetGpuBlacklistHistogramValueWin
UpdateStats
IntSetToString
DisplayReconfigCallback
ApplyAndroidWorkarounds
InitializeForTesting
IsFeatureBlacklisted
IsDriverBugWorkaroundActive
GetBlacklistedFeatureCount
SetDisplayCount
GetDisplayCount
GetGPUInfo
GetGpuProcessHandles
GpuAccessAllowed
RequestCompleteGpuInfoIfNeeded
IsCompleteGpuInfoAvailable
RequestVideoMemoryUsageStatsUpdate
ShouldUseSwiftShader
RegisterSwiftShaderPath
AddObserver
RemoveObserver
UnblockDomainFrom3DAPIs
DisableGpuWatchdog
SetGLStrings
GetGLStrings
Initialize
UpdateGpuInfoHelper
UpdateGpuInfo
UpdateVideoMemoryUsageStats
AppendRendererCommandLine
AppendGpuCommandLine
AppendPluginCommandLine
UpdateRendererWebPrefs
DisableHardwareAcceleration
GetBlacklistVersion
GetDriverBugListVersion
GetBlacklistReasons
GetDriverBugWorkarounds
AddLogMessage
ProcessCrashed
GetLogMessages
HandleGpuSwitch
CanUseGpuBrowserCompositor
BlockDomainFrom3DAPIs
Are3DAPIsBlocked
DisableDomainBlockingFor3DAPIsForTesting
Create
finalized_
InitializeImpl
UpdateBlacklistedFeatures
UpdatePreliminaryBlacklistedFeatures
UpdateGpuSwitchingManager
NotifyGpuInfoUpdate
EnableSwiftShaderIfNecessary
GetDomainFromURL
BlockDomainFrom3DAPIsAtTime
Are3DAPIsBlockedAtTime
GetBlockAllDomainsDurationInMs
Notify3DAPIBlocked
OnGpuProcessInitFailure
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/gpu/gpu_data_manager_impl_private.h"

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sparse_histogram.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/sys_info.h"
#include "base/version.h"
#include "cc/base/switches.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/common/gpu/gpu_messages.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/gpu_data_manager_observer.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "gpu/config/gpu_control_list_jsons.h"
#include "gpu/config/gpu_driver_bug_workaround_type.h"
#include "gpu/config/gpu_feature_type.h"
#include "gpu/config/gpu_info_collector.h"
#include "gpu/config/gpu_util.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_switches.h"
#include "ui/gl/gpu_switching_manager.h"
#include "webkit/common/webpreferences.h"

#if defined(OS_MACOSX)
#include <ApplicationServices/ApplicationServices.h>
#endif  // OS_MACOSX
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif  // OS_WIN
#if defined(OS_ANDROID)
#include "ui/gfx/android/device_display_info.h"
#endif  // OS_ANDROID

namespace content {

namespace {

enum GpuFeatureStatus {
    kGpuFeatureEnabled = 0,
    kGpuFeatureBlacklisted = 1,
    kGpuFeatureDisabled = 2,  // disabled by user but not blacklisted
    kGpuFeatureNumStatus
};

#if defined(OS_WIN)

enum WinSubVersion {
  kWinOthers = 0,
  kWinXP,
  kWinVista,
  kWin7,
  kWin8,
  kNumWinSubVersions
};

int GetGpuBlacklistHistogramValueWin(GpuFeatureStatus status) {
  static WinSubVersion sub_version = kNumWinSubVersions;
  if (sub_version == kNumWinSubVersions) {
    sub_version = kWinOthers;
    std::string version_str = base::SysInfo::OperatingSystemVersion();
    size_t pos = version_str.find_first_not_of("0123456789.");
    if (pos != std::string::npos)
      version_str = version_str.substr(0, pos);
    Version os_version(version_str);
    if (os_version.IsValid() && os_version.components().size() >= 2) {
      const std::vector<uint16>& version_numbers = os_version.components();
      if (version_numbers[0] == 5)
        sub_version = kWinXP;
      else if (version_numbers[0] == 6 && version_numbers[1] == 0)
        sub_version = kWinVista;
      else if (version_numbers[0] == 6 && version_numbers[1] == 1)
        sub_version = kWin7;
      else if (version_numbers[0] == 6 && version_numbers[1] == 2)
        sub_version = kWin8;
    }
  }
  int entry_index = static_cast<int>(sub_version) * kGpuFeatureNumStatus;
  switch (status) {
    case kGpuFeatureEnabled:
      break;
    case kGpuFeatureBlacklisted:
      entry_index++;
      break;
    case kGpuFeatureDisabled:
      entry_index += 2;
      break;
  }
  return entry_index;
}
#endif  // OS_WIN

// Send UMA histograms about the enabled features and GPU properties.
void UpdateStats(const gpu::GPUInfo& gpu_info,
                 const gpu::GpuBlacklist* blacklist,
                 const std::set<int>& blacklisted_features) {
  uint32 max_entry_id = blacklist->max_entry_id();
  if (max_entry_id == 0) {
    // GPU Blacklist was not loaded.  No need to go further.
    return;
  }

  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  bool disabled = false;

  // Use entry 0 to capture the total number of times that data
  // was recorded in this histogram in order to have a convenient
  // denominator to compute blacklist percentages for the rest of the
  // entries.
  UMA_HISTOGRAM_ENUMERATION("GPU.BlacklistTestResultsPerEntry",
      0, max_entry_id + 1);

  if (blacklisted_features.size() != 0) {
    std::vector<uint32> flag_entries;
    blacklist->GetDecisionEntries(&flag_entries, disabled);
    DCHECK_GT(flag_entries.size(), 0u);
    for (size_t i = 0; i < flag_entries.size(); ++i) {
      UMA_HISTOGRAM_ENUMERATION("GPU.BlacklistTestResultsPerEntry",
          flag_entries[i], max_entry_id + 1);
    }
  }

  // This counts how many users are affected by a disabled entry - this allows
  // us to understand the impact of an entry before enable it.
  std::vector<uint32> flag_disabled_entries;
  disabled = true;
  blacklist->GetDecisionEntries(&flag_disabled_entries, disabled);
  for (size_t i = 0; i < flag_disabled_entries.size(); ++i) {
    UMA_HISTOGRAM_ENUMERATION("GPU.BlacklistTestResultsPerDisabledEntry",
        flag_disabled_entries[i], max_entry_id + 1);
  }

  const gpu::GpuFeatureType kGpuFeatures[] = {
      gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS,
      gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING,
      gpu::GPU_FEATURE_TYPE_WEBGL
  };
  const std::string kGpuBlacklistFeatureHistogramNames[] = {
      "GPU.BlacklistFeatureTestResults.Accelerated2dCanvas",
      "GPU.BlacklistFeatureTestResults.AcceleratedCompositing",
      "GPU.BlacklistFeatureTestResults.Webgl",
  };
  const bool kGpuFeatureUserFlags[] = {
      command_line.HasSwitch(switches::kDisableAccelerated2dCanvas),
      command_line.HasSwitch(switches::kDisableAcceleratedCompositing),
      command_line.HasSwitch(switches::kDisableExperimentalWebGL),
  };
#if defined(OS_WIN)
  const std::string kGpuBlacklistFeatureHistogramNamesWin[] = {
      "GPU.BlacklistFeatureTestResultsWindows.Accelerated2dCanvas",
      "GPU.BlacklistFeatureTestResultsWindows.AcceleratedCompositing",
      "GPU.BlacklistFeatureTestResultsWindows.Webgl",
  };
#endif
  const size_t kNumFeatures =
      sizeof(kGpuFeatures) / sizeof(gpu::GpuFeatureType);
  for (size_t i = 0; i < kNumFeatures; ++i) {
    // We can't use UMA_HISTOGRAM_ENUMERATION here because the same name is
    // expected if the macro is used within a loop.
    GpuFeatureStatus value = kGpuFeatureEnabled;
    if (blacklisted_features.count(kGpuFeatures[i]))
      value = kGpuFeatureBlacklisted;
    else if (kGpuFeatureUserFlags[i])
      value = kGpuFeatureDisabled;
    base::HistogramBase* histogram_pointer = base::LinearHistogram::FactoryGet(
        kGpuBlacklistFeatureHistogramNames[i],
        1, kGpuFeatureNumStatus, kGpuFeatureNumStatus + 1,
        base::HistogramBase::kUmaTargetedHistogramFlag);
    histogram_pointer->Add(value);
#if defined(OS_WIN)
    histogram_pointer = base::LinearHistogram::FactoryGet(
        kGpuBlacklistFeatureHistogramNamesWin[i],
        1, kNumWinSubVersions * kGpuFeatureNumStatus,
        kNumWinSubVersions * kGpuFeatureNumStatus + 1,
        base::HistogramBase::kUmaTargetedHistogramFlag);
    histogram_pointer->Add(GetGpuBlacklistHistogramValueWin(value));
#endif
  }

  UMA_HISTOGRAM_SPARSE_SLOWLY("GPU.GLResetNotificationStrategy",
      gpu_info.gl_reset_notification_strategy);
}

// Combine the integers into a string, seperated by ','.
std::string IntSetToString(const std::set<int>& list) {
  std::string rt;
  for (std::set<int>::const_iterator it = list.begin();
       it != list.end(); ++it) {
    if (!rt.empty())
      rt += ",";
    rt += base::IntToString(*it);
  }
  return rt;
}

#if defined(OS_MACOSX)
void DisplayReconfigCallback(CGDirectDisplayID display,
                             CGDisplayChangeSummaryFlags flags,
                             void* gpu_data_manager) {
  if (flags == kCGDisplayBeginConfigurationFlag)
    return; // This call contains no information about the display change

  GpuDataManagerImpl* manager =
      reinterpret_cast<GpuDataManagerImpl*>(gpu_data_manager);
  DCHECK(manager);

  uint32_t displayCount;
  CGGetActiveDisplayList(0, NULL, &displayCount);

  bool fireGpuSwitch = flags & kCGDisplayAddFlag;

  if (displayCount != manager->GetDisplayCount()) {
    manager->SetDisplayCount(displayCount);
    fireGpuSwitch = true;
  }

  if (fireGpuSwitch)
    manager->HandleGpuSwitch();
}
#endif  // OS_MACOSX

#if defined(OS_ANDROID)
void ApplyAndroidWorkarounds(const gpu::GPUInfo& gpu_info,
                             CommandLine* command_line) {
  std::string vendor(StringToLowerASCII(gpu_info.gl_vendor));
  std::string renderer(StringToLowerASCII(gpu_info.gl_renderer));
  bool is_img =
      gpu_info.gl_vendor.find("Imagination") != std::string::npos;

  gfx::DeviceDisplayInfo info;
  int default_tile_size = 256;

  // TODO(epenner): Now that this is somewhat generic, maybe we can
  // unify this for all platforms (http://crbug.com/159524)

  bool real_size_supported = true;
  int display_width = info.GetPhysicalDisplayWidth();
  int display_height = info.GetPhysicalDisplayHeight();
  if (display_width == 0 || display_height == 0) {
    real_size_supported = false;
    display_width = info.GetDisplayWidth();
    display_height = info.GetDisplayHeight();
  }

  int portrait_width = std::min(display_width, display_height);
  int landscape_width = std::max(display_width, display_height);

  if (real_size_supported) {
    // Maximum HD dimensions should be 768x1280
    // Maximum FHD dimensions should be 1200x1920
    if (portrait_width > 768 || landscape_width > 1280)
       default_tile_size = 384;
    if (portrait_width > 1200 || landscape_width > 1920)
       default_tile_size = 512;

    // Adjust for some resolutions that barely straddle an extra
    // tile when in portrait mode. This helps worst case scroll/raster
    // by not needing a full extra tile for each row.
    if (default_tile_size == 256 && portrait_width == 768)
      default_tile_size += 32;
    if (default_tile_size == 384 && portrait_width == 1200)
      default_tile_size += 32;
  } else {
    // We don't know the exact resolution due to screen controls etc.
    // So this just estimates the values above using tile counts.
    int numTiles = (display_width * display_height) / (256 * 256);
    if (numTiles > 16)
      default_tile_size = 384;
    if (numTiles >= 40)
      default_tile_size = 512;
  }

  // IMG: Fast async texture uploads only work with non-power-of-two,
  // but still multiple-of-eight sizes.
  // http://crbug.com/168099
  if (is_img)
    default_tile_size -= 8;

  // Set the command line if it isn't already set and we changed
  // the default tile size.
  if (default_tile_size != 256 &&
      !command_line->HasSwitch(switches::kDefaultTileWidth) &&
      !command_line->HasSwitch(switches::kDefaultTileHeight)) {
    std::stringstream size;
    size << default_tile_size;
    command_line->AppendSwitchASCII(
        switches::kDefaultTileWidth, size.str());
    command_line->AppendSwitchASCII(
        switches::kDefaultTileHeight, size.str());
  }
}
#endif  // OS_ANDROID

// Block all domains' use of 3D APIs for this many milliseconds if
// approaching a threshold where system stability might be compromised.
const int64 kBlockAllDomainsMs = 10000;
const int kNumResetsWithinDuration = 1;

// Enums for UMA histograms.
enum BlockStatusHistogram {
  BLOCK_STATUS_NOT_BLOCKED,
  BLOCK_STATUS_SPECIFIC_DOMAIN_BLOCKED,
  BLOCK_STATUS_ALL_DOMAINS_BLOCKED,
  BLOCK_STATUS_MAX
};

}  // namespace anonymous

void GpuDataManagerImplPrivate::InitializeForTesting(
    const std::string& gpu_blacklist_json,
    const gpu::GPUInfo& gpu_info) {
  // This function is for testing only, so disable histograms.
  update_histograms_ = false;

  // Prevent all further initialization.
  finalized_ = true;

  InitializeImpl(gpu_blacklist_json, std::string(), gpu_info);
}

bool GpuDataManagerImplPrivate::IsFeatureBlacklisted(int feature) const {
#if defined(OS_CHROMEOS)
  if (feature == gpu::GPU_FEATURE_TYPE_PANEL_FITTING &&
      CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisablePanelFitting)) {
    return true;
  }
#endif  // OS_CHROMEOS
  if (use_swiftshader_) {
    // Skia's software rendering is probably more efficient than going through
    // software emulation of the GPU, so use that.
    if (feature == gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS)
      return true;
    return false;
  }

  return (blacklisted_features_.count(feature) == 1);
}

bool GpuDataManagerImplPrivate::IsDriverBugWorkaroundActive(int feature) const {
  return (gpu_driver_bugs_.count(feature) == 1);
}

size_t GpuDataManagerImplPrivate::GetBlacklistedFeatureCount() const {
  if (use_swiftshader_)
    return 1;
  return blacklisted_features_.size();
}

void GpuDataManagerImplPrivate::SetDisplayCount(unsigned int display_count) {
  display_count_ = display_count;
}

unsigned int GpuDataManagerImplPrivate::GetDisplayCount() const {
  return display_count_;
}

gpu::GPUInfo GpuDataManagerImplPrivate::GetGPUInfo() const {
  return gpu_info_;
}

void GpuDataManagerImplPrivate::GetGpuProcessHandles(
    const GpuDataManager::GetGpuProcessHandlesCallback& callback) const {
  GpuProcessHost::GetProcessHandles(callback);
}

bool GpuDataManagerImplPrivate::GpuAccessAllowed(
    std::string* reason) const {
  if (use_swiftshader_)
    return true;

  if (!gpu_process_accessible_) {
    if (reason) {
      *reason = "GPU process launch failed.";
    }
    return false;
  }

  if (card_blacklisted_) {
    if (reason) {
      *reason = "GPU access is disabled ";
      CommandLine* command_line = CommandLine::ForCurrentProcess();
      if (command_line->HasSwitch(switches::kDisableGpu))
        *reason += "through commandline switch --disable-gpu.";
      else
        *reason += "in chrome://settings.";
    }
    return false;
  }

  // We only need to block GPU process if more features are disallowed other
  // than those in the preliminary gpu feature flags because the latter work
  // through renderer commandline switches.
  std::set<int> features = preliminary_blacklisted_features_;
  gpu::MergeFeatureSets(&features, blacklisted_features_);
  if (features.size() > preliminary_blacklisted_features_.size()) {
    if (reason) {
      *reason = "Features are disabled upon full but not preliminary GPU info.";
    }
    return false;
  }

  if (blacklisted_features_.size() == gpu::NUMBER_OF_GPU_FEATURE_TYPES) {
    // On Linux, we use cached GL strings to make blacklist decsions at browser
    // startup time. We need to launch the GPU process to validate these
    // strings even if all features are blacklisted. If all GPU features are
    // disabled, the GPU process will only initialize GL bindings, create a GL
    // context, and collect full GPU info.
#if !defined(OS_LINUX)
    if (reason) {
      *reason = "All GPU features are blacklisted.";
    }
    return false;
#endif
  }

  return true;
}

void GpuDataManagerImplPrivate::RequestCompleteGpuInfoIfNeeded() {
  if (complete_gpu_info_already_requested_ || gpu_info_.finalized)
    return;
  complete_gpu_info_already_requested_ = true;

  GpuProcessHost::SendOnIO(
#if defined(OS_WIN)
      GpuProcessHost::GPU_PROCESS_KIND_UNSANDBOXED,
#else
      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
#endif
      CAUSE_FOR_GPU_LAUNCH_GPUDATAMANAGER_REQUESTCOMPLETEGPUINFOIFNEEDED,
      new GpuMsg_CollectGraphicsInfo());
}

bool GpuDataManagerImplPrivate::IsCompleteGpuInfoAvailable() const {
  return gpu_info_.finalized;
}

void GpuDataManagerImplPrivate::RequestVideoMemoryUsageStatsUpdate() const {
  GpuProcessHost::SendOnIO(
      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
      CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
      new GpuMsg_GetVideoMemoryUsageStats());
}

bool GpuDataManagerImplPrivate::ShouldUseSwiftShader() const {
  return use_swiftshader_;
}

void GpuDataManagerImplPrivate::RegisterSwiftShaderPath(
    const base::FilePath& path) {
  swiftshader_path_ = path;
  EnableSwiftShaderIfNecessary();
}

void GpuDataManagerImplPrivate::AddObserver(GpuDataManagerObserver* observer) {
  GpuDataManagerImpl::UnlockedSession session(owner_);
  observer_list_->AddObserver(observer);
}

void GpuDataManagerImplPrivate::RemoveObserver(
    GpuDataManagerObserver* observer) {
  GpuDataManagerImpl::UnlockedSession session(owner_);
  observer_list_->RemoveObserver(observer);
}

void GpuDataManagerImplPrivate::UnblockDomainFrom3DAPIs(const GURL& url) {
  // This method must do two things:
  //
  //  1. If the specific domain is blocked, then unblock it.
  //
  //  2. Reset our notion of how many GPU resets have occurred recently.
  //     This is necessary even if the specific domain was blocked.
  //     Otherwise, if we call Are3DAPIsBlocked with the same domain right
  //     after unblocking it, it will probably still be blocked because of
  //     the recent GPU reset caused by that domain.
  //
  // These policies could be refined, but at a certain point the behavior
  // will become difficult to explain.
  std::string domain = GetDomainFromURL(url);

  blocked_domains_.erase(domain);
  timestamps_of_gpu_resets_.clear();
}

void GpuDataManagerImplPrivate::DisableGpuWatchdog() {
  GpuProcessHost::SendOnIO(
      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
      CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
      new GpuMsg_DisableWatchdog);
}

void GpuDataManagerImplPrivate::SetGLStrings(const std::string& gl_vendor,
                                             const std::string& gl_renderer,
                                             const std::string& gl_version) {
  if (gl_vendor.empty() && gl_renderer.empty() && gl_version.empty())
    return;

  // If GPUInfo already got GL strings, do nothing.  This is for the rare
  // situation where GPU process collected GL strings before this call.
  if (!gpu_info_.gl_vendor.empty() ||
      !gpu_info_.gl_renderer.empty() ||
      !gpu_info_.gl_version_string.empty())
    return;

  gpu::GPUInfo gpu_info = gpu_info_;

  gpu_info.gl_vendor = gl_vendor;
  gpu_info.gl_renderer = gl_renderer;
  gpu_info.gl_version_string = gl_version;

  gpu::CollectDriverInfoGL(&gpu_info);

  UpdateGpuInfo(gpu_info);
  UpdateGpuSwitchingManager(gpu_info);
  UpdatePreliminaryBlacklistedFeatures();
}

void GpuDataManagerImplPrivate::GetGLStrings(std::string* gl_vendor,
                                             std::string* gl_renderer,
                                             std::string* gl_version) {
  DCHECK(gl_vendor && gl_renderer && gl_version);

  *gl_vendor = gpu_info_.gl_vendor;
  *gl_renderer = gpu_info_.gl_renderer;
  *gl_version = gpu_info_.gl_version_string;
}

void GpuDataManagerImplPrivate::Initialize() {
  TRACE_EVENT0("startup", "GpuDataManagerImpl::Initialize");
  if (finalized_) {
    DVLOG(0) << "GpuDataManagerImpl marked as finalized; skipping Initialize";
    return;
  }

  const CommandLine* command_line = CommandLine::ForCurrentProcess();
  if (command_line->HasSwitch(switches::kSkipGpuDataLoading))
    return;

  gpu::GPUInfo gpu_info;
  if (command_line->GetSwitchValueASCII(
          switches::kUseGL) == gfx::kGLImplementationOSMesaName) {
    // If using the OSMesa GL implementation, use fake vendor and device ids to
    // make sure it never gets blacklisted. This is better than simply
    // cancelling GPUInfo gathering as it allows us to proceed with loading the
    // blacklist below which may have non-device specific entries we want to
    // apply anyways (e.g., OS version blacklisting).
    gpu_info.gpu.vendor_id = 0xffff;
    gpu_info.gpu.device_id = 0xffff;

    // Also declare the driver_vendor to be osmesa to be able to specify
    // exceptions based on driver_vendor==osmesa for some blacklist rules.
    gpu_info.driver_vendor = gfx::kGLImplementationOSMesaName;
  } else {
    TRACE_EVENT0("startup",
      "GpuDataManagerImpl::Initialize:CollectBasicGraphicsInfo");
    gpu::CollectBasicGraphicsInfo(&gpu_info);
  }
#if defined(ARCH_CPU_X86_FAMILY)
  if (!gpu_info.gpu.vendor_id || !gpu_info.gpu.device_id)
    gpu_info.finalized = true;
#endif

  std::string gpu_blacklist_string;
  std::string gpu_driver_bug_list_string;
  if (!command_line->HasSwitch(switches::kIgnoreGpuBlacklist) &&
      !command_line->HasSwitch(switches::kUseGpuInTests)) {
    gpu_blacklist_string = gpu::kSoftwareRenderingListJson;
  }
  if (!command_line->HasSwitch(switches::kDisableGpuDriverBugWorkarounds)) {
    gpu_driver_bug_list_string = gpu::kGpuDriverBugListJson;
  }
  InitializeImpl(gpu_blacklist_string,
                 gpu_driver_bug_list_string,
                 gpu_info);
}

void GpuDataManagerImplPrivate::UpdateGpuInfoHelper() {
  GetContentClient()->SetGpuInfo(gpu_info_);

  if (gpu_blacklist_) {
    std::set<int> features = gpu_blacklist_->MakeDecision(
        gpu::GpuControlList::kOsAny, std::string(), gpu_info_);
    if (update_histograms_)
      UpdateStats(gpu_info_, gpu_blacklist_.get(), features);

    UpdateBlacklistedFeatures(features);
  }
  if (gpu_driver_bug_list_) {
    gpu_driver_bugs_ = gpu_driver_bug_list_->MakeDecision(
        gpu::GpuControlList::kOsAny, std::string(), gpu_info_);
  }
  gpu::GpuDriverBugList::AppendWorkaroundsFromCommandLine(
      &gpu_driver_bugs_, *CommandLine::ForCurrentProcess());

  // We have to update GpuFeatureType before notify all the observers.
  NotifyGpuInfoUpdate();
}

void GpuDataManagerImplPrivate::UpdateGpuInfo(const gpu::GPUInfo& gpu_info) {
  // No further update of gpu_info if falling back to SwiftShader.
  if (use_swiftshader_)
    return;

  gpu::MergeGPUInfo(&gpu_info_, gpu_info);
  complete_gpu_info_already_requested_ =
      complete_gpu_info_already_requested_ || gpu_info_.finalized;

  UpdateGpuInfoHelper();
}

void GpuDataManagerImplPrivate::UpdateVideoMemoryUsageStats(
    const GPUVideoMemoryUsageStats& video_memory_usage_stats) {
  GpuDataManagerImpl::UnlockedSession session(owner_);
  observer_list_->Notify(&GpuDataManagerObserver::OnVideoMemoryUsageStatsUpdate,
                         video_memory_usage_stats);
}

void GpuDataManagerImplPrivate::AppendRendererCommandLine(
    CommandLine* command_line) const {
  DCHECK(command_line);

  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) &&
      !command_line->HasSwitch(switches::kDisableAcceleratedCompositing))
    command_line->AppendSwitch(switches::kDisableAcceleratedCompositing);
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE) &&
      !command_line->HasSwitch(switches::kDisableAcceleratedVideoDecode))
    command_line->AppendSwitch(switches::kDisableAcceleratedVideoDecode);
#if defined(ENABLE_WEBRTC)
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_ENCODE) &&
      !command_line->HasSwitch(switches::kDisableWebRtcHWEncoding))
    command_line->AppendSwitch(switches::kDisableWebRtcHWEncoding);
#endif

  if (use_software_compositor_ &&
      !command_line->HasSwitch(switches::kEnableSoftwareCompositing))
    command_line->AppendSwitch(switches::kEnableSoftwareCompositing);

#if defined(USE_AURA)
  if (!CanUseGpuBrowserCompositor())
    command_line->AppendSwitch(switches::kDisableGpuCompositing);
#endif
}

void GpuDataManagerImplPrivate::AppendGpuCommandLine(
    CommandLine* command_line) const {
  DCHECK(command_line);

  std::string use_gl =
      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(switches::kUseGL);
  base::FilePath swiftshader_path =
      CommandLine::ForCurrentProcess()->GetSwitchValuePath(
          switches::kSwiftShaderPath);
  if (gpu_driver_bugs_.find(gpu::DISABLE_D3D11) != gpu_driver_bugs_.end())
    command_line->AppendSwitch(switches::kDisableD3D11);
  if (use_swiftshader_) {
    command_line->AppendSwitchASCII(switches::kUseGL, "swiftshader");
    if (swiftshader_path.empty())
      swiftshader_path = swiftshader_path_;
  } else if ((IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_WEBGL) ||
              IsFeatureBlacklisted(
                  gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) ||
              IsFeatureBlacklisted(
                  gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS)) &&
      (use_gl == "any")) {
    command_line->AppendSwitchASCII(
        switches::kUseGL, gfx::kGLImplementationOSMesaName);
  } else if (!use_gl.empty()) {
    command_line->AppendSwitchASCII(switches::kUseGL, use_gl);
  }
  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus())
    command_line->AppendSwitchASCII(switches::kSupportsDualGpus, "true");
  else
    command_line->AppendSwitchASCII(switches::kSupportsDualGpus, "false");

  if (!swiftshader_path.empty()) {
    command_line->AppendSwitchPath(switches::kSwiftShaderPath,
                                   swiftshader_path);
  }

  if (!gpu_driver_bugs_.empty()) {
    command_line->AppendSwitchASCII(switches::kGpuDriverBugWorkarounds,
                                    IntSetToString(gpu_driver_bugs_));
  }

  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE) &&
      !command_line->HasSwitch(switches::kDisableAcceleratedVideoDecode)) {
    command_line->AppendSwitch(switches::kDisableAcceleratedVideoDecode);
  }
#if defined(ENABLE_WEBRTC)
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_ENCODE) &&
      !command_line->HasSwitch(switches::kDisableWebRtcHWEncoding)) {
    command_line->AppendSwitch(switches::kDisableWebRtcHWEncoding);
  }
#endif

  // Pass GPU and driver information to GPU process. We try to avoid full GPU
  // info collection at GPU process startup, but we need gpu vendor_id,
  // device_id, driver_vendor, driver_version for deciding whether we need to
  // collect full info (on Linux) and for crash reporting purpose.
  command_line->AppendSwitchASCII(switches::kGpuVendorID,
      base::StringPrintf("0x%04x", gpu_info_.gpu.vendor_id));
  command_line->AppendSwitchASCII(switches::kGpuDeviceID,
      base::StringPrintf("0x%04x", gpu_info_.gpu.device_id));
  command_line->AppendSwitchASCII(switches::kGpuDriverVendor,
      gpu_info_.driver_vendor);
  command_line->AppendSwitchASCII(switches::kGpuDriverVersion,
      gpu_info_.driver_version);
}

void GpuDataManagerImplPrivate::AppendPluginCommandLine(
    CommandLine* command_line) const {
  DCHECK(command_line);

#if defined(OS_MACOSX)
  // TODO(jbauman): Add proper blacklist support for core animation plugins so
  // special-casing this video card won't be necessary. See
  // http://crbug.com/134015
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) ||
      CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableAcceleratedCompositing)) {
    if (!command_line->HasSwitch(
           switches::kDisableCoreAnimationPlugins))
      command_line->AppendSwitch(
          switches::kDisableCoreAnimationPlugins);
  }
#endif
}

void GpuDataManagerImplPrivate::UpdateRendererWebPrefs(
    WebPreferences* prefs) const {
  DCHECK(prefs);

  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING))
    prefs->accelerated_compositing_enabled = false;
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_WEBGL)) {
    prefs->experimental_webgl_enabled = false;
    prefs->pepper_3d_enabled = false;
  }
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_FLASH3D))
    prefs->flash_3d_enabled = false;
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_FLASH_STAGE3D)) {
    prefs->flash_stage3d_enabled = false;
    prefs->flash_stage3d_baseline_enabled = false;
  }
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_FLASH_STAGE3D_BASELINE))
    prefs->flash_stage3d_baseline_enabled = false;
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS))
    prefs->accelerated_2d_canvas_enabled = false;
  if (IsDriverBugWorkaroundActive(gpu::DISABLE_MULTISAMPLING) ||
      (IsDriverBugWorkaroundActive(gpu::DISABLE_MULTIMONITOR_MULTISAMPLING) &&
          display_count_ > 1))
    prefs->gl_multisampling_enabled = false;
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_3D_CSS)) {
    prefs->accelerated_compositing_for_3d_transforms_enabled = false;
    prefs->accelerated_compositing_for_animation_enabled = false;
  }
  if (IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO))
    prefs->accelerated_compositing_for_video_enabled = false;

  // Accelerated video and animation are slower than regular when using
  // SwiftShader. 3D CSS or Pepper 3D may also be too slow to be worthwhile.
  if (ShouldUseSwiftShader()) {
    prefs->accelerated_compositing_for_video_enabled = false;
    prefs->accelerated_compositing_for_animation_enabled = false;
    prefs->accelerated_compositing_for_3d_transforms_enabled = false;
    prefs->accelerated_compositing_for_plugins_enabled = false;
    prefs->pepper_3d_enabled = false;
  }

  if (use_software_compositor_) {
    prefs->force_compositing_mode = true;
    prefs->accelerated_compositing_enabled = true;
    prefs->accelerated_compositing_for_3d_transforms_enabled = true;
    prefs->accelerated_compositing_for_animation_enabled = true;
    prefs->accelerated_compositing_for_plugins_enabled = true;
    prefs->accelerated_compositing_for_video_enabled = true;
  }

#if defined(USE_AURA)
  if (!CanUseGpuBrowserCompositor()) {
    prefs->accelerated_2d_canvas_enabled = false;
    prefs->pepper_3d_enabled = false;
  }
#endif

  if (!IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE) &&
      !CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableAcceleratedVideoDecode)) {
    prefs->pepper_accelerated_video_decode_enabled = true;
  }
}

void GpuDataManagerImplPrivate::DisableHardwareAcceleration() {
  card_blacklisted_ = true;

  for (int i = 0; i < gpu::NUMBER_OF_GPU_FEATURE_TYPES; ++i)
    blacklisted_features_.insert(i);

  EnableSwiftShaderIfNecessary();
  NotifyGpuInfoUpdate();
}

std::string GpuDataManagerImplPrivate::GetBlacklistVersion() const {
  if (gpu_blacklist_)
    return gpu_blacklist_->version();
  return "0";
}

std::string GpuDataManagerImplPrivate::GetDriverBugListVersion() const {
  if (gpu_driver_bug_list_)
    return gpu_driver_bug_list_->version();
  return "0";
}

void GpuDataManagerImplPrivate::GetBlacklistReasons(
    base::ListValue* reasons) const {
  if (gpu_blacklist_)
    gpu_blacklist_->GetReasons(reasons, "disabledFeatures");
  if (gpu_driver_bug_list_)
    gpu_driver_bug_list_->GetReasons(reasons, "workarounds");
}

void GpuDataManagerImplPrivate::GetDriverBugWorkarounds(
    base::ListValue* workarounds) const {
  for (std::set<int>::const_iterator it = gpu_driver_bugs_.begin();
       it != gpu_driver_bugs_.end(); ++it) {
    workarounds->AppendString(
        gpu::GpuDriverBugWorkaroundTypeToString(
            static_cast<gpu::GpuDriverBugWorkaroundType>(*it)));
  }
}

void GpuDataManagerImplPrivate::AddLogMessage(
    int level, const std::string& header, const std::string& message) {
  log_messages_.push_back(LogMessage(level, header, message));
}

void GpuDataManagerImplPrivate::ProcessCrashed(
    base::TerminationStatus exit_code) {
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    // Unretained is ok, because it's posted to UI thread, the thread
    // where the singleton GpuDataManagerImpl lives until the end.
    BrowserThread::PostTask(
        BrowserThread::UI,
        FROM_HERE,
        base::Bind(&GpuDataManagerImpl::ProcessCrashed,
                   base::Unretained(owner_),
                   exit_code));
    return;
  }
  {
    GpuDataManagerImpl::UnlockedSession session(owner_);
    observer_list_->Notify(
        &GpuDataManagerObserver::OnGpuProcessCrashed, exit_code);
  }
}

base::ListValue* GpuDataManagerImplPrivate::GetLogMessages() const {
  base::ListValue* value = new base::ListValue;
  for (size_t ii = 0; ii < log_messages_.size(); ++ii) {
    base::DictionaryValue* dict = new base::DictionaryValue();
    dict->SetInteger("level", log_messages_[ii].level);
    dict->SetString("header", log_messages_[ii].header);
    dict->SetString("message", log_messages_[ii].message);
    value->Append(dict);
  }
  return value;
}

void GpuDataManagerImplPrivate::HandleGpuSwitch() {
  // Check if the active gpu has changed.
  uint32 vendor_id, device_id;
  gpu::GPUInfo::GPUDevice* active = NULL;
  gpu::GPUInfo::GPUDevice* old_active = NULL;
  if (gpu::CollectGpuID(&vendor_id, &device_id) == gpu::kGpuIDSuccess) {
    if (gpu_info_.gpu.active)
      old_active = &gpu_info_.gpu;
    if (gpu_info_.gpu.vendor_id == vendor_id &&
        gpu_info_.gpu.device_id == device_id)
      active = &gpu_info_.gpu;
    for (size_t ii = 0; ii < gpu_info_.secondary_gpus.size(); ++ii) {
      gpu::GPUInfo::GPUDevice& gpu = gpu_info_.secondary_gpus[ii];
      if (gpu.active)
        old_active = &gpu;
      if (gpu.vendor_id == vendor_id && gpu.device_id == device_id)
        active = &gpu;
    }
    DCHECK(active && old_active);
    if (active != old_active) {  // A different GPU is used.
      old_active->active = false;
      active->active = true;
      UpdateGpuInfoHelper();
    }
  }
  {
    GpuDataManagerImpl::UnlockedSession session(owner_);
    observer_list_->Notify(&GpuDataManagerObserver::OnGpuSwitching);
  }
}

bool GpuDataManagerImplPrivate::CanUseGpuBrowserCompositor() const {
  return !ShouldUseSwiftShader() &&
         !IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) &&
         !IsFeatureBlacklisted(gpu::GPU_FEATURE_TYPE_FORCE_COMPOSITING_MODE);
}

void GpuDataManagerImplPrivate::BlockDomainFrom3DAPIs(
    const GURL& url, GpuDataManagerImpl::DomainGuilt guilt) {
  BlockDomainFrom3DAPIsAtTime(url, guilt, base::Time::Now());
}

bool GpuDataManagerImplPrivate::Are3DAPIsBlocked(const GURL& url,
                                                 int render_process_id,
                                                 int render_view_id,
                                                 ThreeDAPIType requester) {
  bool blocked = Are3DAPIsBlockedAtTime(url, base::Time::Now()) !=
      GpuDataManagerImpl::DOMAIN_BLOCK_STATUS_NOT_BLOCKED;
  if (blocked) {
    // Unretained is ok, because it's posted to UI thread, the thread
    // where the singleton GpuDataManagerImpl lives until the end.
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&GpuDataManagerImpl::Notify3DAPIBlocked,
                   base::Unretained(owner_), url, render_process_id,
                   render_view_id, requester));
  }

  return blocked;
}

void GpuDataManagerImplPrivate::DisableDomainBlockingFor3DAPIsForTesting() {
  domain_blocking_enabled_ = false;
}

// static
GpuDataManagerImplPrivate* GpuDataManagerImplPrivate::Create(
    GpuDataManagerImpl* owner) {
  return new GpuDataManagerImplPrivate(owner);
}

GpuDataManagerImplPrivate::GpuDataManagerImplPrivate(
    GpuDataManagerImpl* owner)
    : complete_gpu_info_already_requested_(false),
      observer_list_(new GpuDataManagerObserverList),
      use_swiftshader_(false),
      card_blacklisted_(false),
      update_histograms_(true),
      window_count_(0),
      domain_blocking_enabled_(true),
      owner_(owner),
      display_count_(0),
      gpu_process_accessible_(true),
      use_software_compositor_(false),
      finalized_(false) {
  DCHECK(owner_);
  CommandLine* command_line = CommandLine::ForCurrentProcess();
  if (command_line->HasSwitch(switches::kDisableAcceleratedCompositing)) {
    command_line->AppendSwitch(switches::kDisableAccelerated2dCanvas);
    command_line->AppendSwitch(switches::kDisableAcceleratedLayers);
  }
  if (command_line->HasSwitch(switches::kDisableGpu))
    DisableHardwareAcceleration();
  if (command_line->HasSwitch(switches::kEnableSoftwareCompositing))
    use_software_compositor_ = true;
#if defined(USE_AURA) || defined(OS_MACOSX)
  use_software_compositor_ = true;
#endif

#if defined(OS_MACOSX)
  CGGetActiveDisplayList (0, NULL, &display_count_);
  CGDisplayRegisterReconfigurationCallback(DisplayReconfigCallback, owner_);
#endif  // OS_MACOSX

  // For testing only.
  if (command_line->HasSwitch(switches::kDisableDomainBlockingFor3DAPIs)) {
    domain_blocking_enabled_ = false;
  }
}

GpuDataManagerImplPrivate::~GpuDataManagerImplPrivate() {
#if defined(OS_MACOSX)
  CGDisplayRemoveReconfigurationCallback(DisplayReconfigCallback, owner_);
#endif
}

void GpuDataManagerImplPrivate::InitializeImpl(
    const std::string& gpu_blacklist_json,
    const std::string& gpu_driver_bug_list_json,
    const gpu::GPUInfo& gpu_info) {
  const bool log_gpu_control_list_decisions =
      CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kLogGpuControlListDecisions);

  if (!gpu_blacklist_json.empty()) {
    gpu_blacklist_.reset(gpu::GpuBlacklist::Create());
    if (log_gpu_control_list_decisions)
      gpu_blacklist_->enable_control_list_logging("gpu_blacklist");
    bool success = gpu_blacklist_->LoadList(
        gpu_blacklist_json, gpu::GpuControlList::kCurrentOsOnly);
    DCHECK(success);
  }
  if (!gpu_driver_bug_list_json.empty()) {
    gpu_driver_bug_list_.reset(gpu::GpuDriverBugList::Create());
    if (log_gpu_control_list_decisions)
      gpu_driver_bug_list_->enable_control_list_logging("gpu_driver_bug_list");
    bool success = gpu_driver_bug_list_->LoadList(
        gpu_driver_bug_list_json, gpu::GpuControlList::kCurrentOsOnly);
    DCHECK(success);
  }

  gpu_info_ = gpu_info;
  UpdateGpuInfo(gpu_info);
  UpdateGpuSwitchingManager(gpu_info);
  UpdatePreliminaryBlacklistedFeatures();

#if defined(OS_ANDROID)
  ApplyAndroidWorkarounds(gpu_info, CommandLine::ForCurrentProcess());
#endif  // OS_ANDROID
}

void GpuDataManagerImplPrivate::UpdateBlacklistedFeatures(
    const std::set<int>& features) {
  CommandLine* command_line = CommandLine::ForCurrentProcess();
  blacklisted_features_ = features;

  // Force disable using the GPU for these features, even if they would
  // otherwise be allowed.
  if (card_blacklisted_ ||
      command_line->HasSwitch(switches::kBlacklistAcceleratedCompositing)) {
    blacklisted_features_.insert(
        gpu::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING);
  }
  if (card_blacklisted_ ||
      command_line->HasSwitch(switches::kBlacklistWebGL)) {
    blacklisted_features_.insert(gpu::GPU_FEATURE_TYPE_WEBGL);
  }

  EnableSwiftShaderIfNecessary();
}

void GpuDataManagerImplPrivate::UpdatePreliminaryBlacklistedFeatures() {
  preliminary_blacklisted_features_ = blacklisted_features_;
}

void GpuDataManagerImplPrivate::UpdateGpuSwitchingManager(
    const gpu::GPUInfo& gpu_info) {
  ui::GpuSwitchingManager::GetInstance()->SetGpuCount(
      gpu_info.secondary_gpus.size() + 1);

  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
    if (gpu_driver_bugs_.count(gpu::FORCE_DISCRETE_GPU) == 1)
      ui::GpuSwitchingManager::GetInstance()->ForceUseOfDiscreteGpu();
    else if (gpu_driver_bugs_.count(gpu::FORCE_INTEGRATED_GPU) == 1)
      ui::GpuSwitchingManager::GetInstance()->ForceUseOfIntegratedGpu();
  }
}

void GpuDataManagerImplPrivate::NotifyGpuInfoUpdate() {
  observer_list_->Notify(&GpuDataManagerObserver::OnGpuInfoUpdate);
}

void GpuDataManagerImplPrivate::EnableSwiftShaderIfNecessary() {
  if (!GpuAccessAllowed(NULL) ||
      blacklisted_features_.count(gpu::GPU_FEATURE_TYPE_WEBGL)) {
    if (!swiftshader_path_.empty() &&
        !CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kDisableSoftwareRasterizer))
      use_swiftshader_ = true;
  }
}

std::string GpuDataManagerImplPrivate::GetDomainFromURL(
    const GURL& url) const {
  // For the moment, we just use the host, or its IP address, as the
  // entry in the set, rather than trying to figure out the top-level
  // domain. This does mean that a.foo.com and b.foo.com will be
  // treated independently in the blocking of a given domain, but it
  // would require a third-party library to reliably figure out the
  // top-level domain from a URL.
  if (!url.has_host()) {
    return std::string();
  }

  return url.host();
}

void GpuDataManagerImplPrivate::BlockDomainFrom3DAPIsAtTime(
    const GURL& url,
    GpuDataManagerImpl::DomainGuilt guilt,
    base::Time at_time) {
  if (!domain_blocking_enabled_)
    return;

  std::string domain = GetDomainFromURL(url);

  DomainBlockEntry& entry = blocked_domains_[domain];
  entry.last_guilt = guilt;
  timestamps_of_gpu_resets_.push_back(at_time);
}

GpuDataManagerImpl::DomainBlockStatus
GpuDataManagerImplPrivate::Are3DAPIsBlockedAtTime(
    const GURL& url, base::Time at_time) const {
  if (!domain_blocking_enabled_)
    return GpuDataManagerImpl::DOMAIN_BLOCK_STATUS_NOT_BLOCKED;

  // Note: adjusting the policies in this code will almost certainly
  // require adjusting the associated unit tests.
  std::string domain = GetDomainFromURL(url);

  DomainBlockMap::const_iterator iter = blocked_domains_.find(domain);
  if (iter != blocked_domains_.end()) {
    // Err on the side of caution, and assume that if a particular
    // domain shows up in the block map, it's there for a good
    // reason and don't let its presence there automatically expire.

    UMA_HISTOGRAM_ENUMERATION("GPU.BlockStatusForClient3DAPIs",
                              BLOCK_STATUS_SPECIFIC_DOMAIN_BLOCKED,
                              BLOCK_STATUS_MAX);

    return GpuDataManagerImpl::DOMAIN_BLOCK_STATUS_BLOCKED;
  }

  // Look at the timestamps of the recent GPU resets to see if there are
  // enough within the threshold which would cause us to blacklist all
  // domains. This doesn't need to be overly precise -- if time goes
  // backward due to a system clock adjustment, that's fine.
  //
  // TODO(kbr): make this pay attention to the TDR thresholds in the
  // Windows registry, but make sure it continues to be testable.
  {
    std::list<base::Time>::iterator iter = timestamps_of_gpu_resets_.begin();
    int num_resets_within_timeframe = 0;
    while (iter != timestamps_of_gpu_resets_.end()) {
      base::Time time = *iter;
      base::TimeDelta delta_t = at_time - time;

      // If this entry has "expired", just remove it.
      if (delta_t.InMilliseconds() > kBlockAllDomainsMs) {
        iter = timestamps_of_gpu_resets_.erase(iter);
        continue;
      }

      ++num_resets_within_timeframe;
      ++iter;
    }

    if (num_resets_within_timeframe >= kNumResetsWithinDuration) {
      UMA_HISTOGRAM_ENUMERATION("GPU.BlockStatusForClient3DAPIs",
                                BLOCK_STATUS_ALL_DOMAINS_BLOCKED,
                                BLOCK_STATUS_MAX);

      return GpuDataManagerImpl::DOMAIN_BLOCK_STATUS_ALL_DOMAINS_BLOCKED;
    }
  }

  UMA_HISTOGRAM_ENUMERATION("GPU.BlockStatusForClient3DAPIs",
                            BLOCK_STATUS_NOT_BLOCKED,
                            BLOCK_STATUS_MAX);

  return GpuDataManagerImpl::DOMAIN_BLOCK_STATUS_NOT_BLOCKED;
}

int64 GpuDataManagerImplPrivate::GetBlockAllDomainsDurationInMs() const {
  return kBlockAllDomainsMs;
}

void GpuDataManagerImplPrivate::Notify3DAPIBlocked(const GURL& url,
                                                   int render_process_id,
                                                   int render_view_id,
                                                   ThreeDAPIType requester) {
  GpuDataManagerImpl::UnlockedSession session(owner_);
  observer_list_->Notify(&GpuDataManagerObserver::DidBlock3DAPIs,
                         url, render_process_id, render_view_id, requester);
}

void GpuDataManagerImplPrivate::OnGpuProcessInitFailure() {
  gpu_process_accessible_ = false;
  gpu_info_.finalized = true;
  complete_gpu_info_already_requested_ = true;
  // Some observers might be waiting.
  NotifyGpuInfoUpdate();
}

}  // namespace content
/* [<][>][^][v][top][bottom][index][help] */
root/content/browser/gpu/gpu_data_manager_impl_private.cc

DEFINITIONS
