content/browser/gpu/gpu_process

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This source file includes following definitions.
SendGpuProcessMessage
AcceleratedSurfaceBuffersSwappedCompletedForGPU
AcceleratedSurfaceBuffersSwappedCompletedForRenderer
AcceleratedSurfaceBuffersSwappedCompleted
ipc_fd_
ShouldSandbox
PreSandbox
PreSpawnTarget
GetIpcFd
ValidateHost
Get
GetProcessHandles
SendOnIO
RegisterGpuMainThreadFactory
FromID
uma_memory_stats_received_
Init
RouteOnUIThread
Send
AddFilter
OnMessageReceived
OnChannelConnected
EstablishGpuChannel
CreateViewCommandBuffer
CreateImage
DeleteImage
OnInitialized
OnChannelEstablished
OnCommandBufferCreated
OnDestroyCommandBuffer
OnImageCreated
OnDidCreateOffscreenContext
OnDidLoseContext
OnDidDestroyOffscreenContext
OnGpuMemoryUmaStatsReceived
OnAcceleratedSurfaceBuffersSwapped
OnAcceleratedSurfaceBuffersSwapped
OnAcceleratedSurfacePostSubBuffer
OnAcceleratedSurfaceSuspend
OnAcceleratedSurfaceRelease
OnProcessLaunched
OnProcessCrashed
kind
ForceShutdown
BeginFrameSubscription
EndFrameSubscription
LaunchGpuProcess
SendOutstandingReplies
BlockLiveOffscreenContexts
GetShaderPrefixKey
LoadedShader
CreateChannelCache
OnDestroyChannel
OnCacheShader
// Copyright (c) 2012 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_process_host.h"

#include "base/base64.h"
#include "base/base_switches.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/metrics/histogram.h"
#include "base/sha1.h"
#include "base/threading/thread.h"
#include "content/browser/browser_child_process_host_impl.h"
#include "content/browser/gpu/gpu_data_manager_impl.h"
#include "content/browser/gpu/gpu_process_host_ui_shim.h"
#include "content/browser/gpu/shader_disk_cache.h"
#include "content/browser/renderer_host/render_widget_helper.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/common/child_process_host_impl.h"
#include "content/common/gpu/gpu_messages.h"
#include "content/common/view_messages.h"
#include "content/port/browser/render_widget_host_view_frame_subscriber.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/sandboxed_process_launcher_delegate.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "ipc/ipc_channel_handle.h"
#include "ipc/ipc_switches.h"
#include "ui/events/latency_info.h"
#include "ui/gl/gl_switches.h"


#if defined(OS_WIN)
#include "base/win/windows_version.h"
#include "content/common/sandbox_win.h"
#include "sandbox/win/src/sandbox_policy.h"
#include "ui/gfx/switches.h"
#endif

#if defined(USE_OZONE)
#include "ui/ozone/ozone_switches.h"
#endif

namespace content {

bool GpuProcessHost::gpu_enabled_ = true;
bool GpuProcessHost::hardware_gpu_enabled_ = true;

namespace {

enum GPUProcessLifetimeEvent {
  LAUNCHED,
  DIED_FIRST_TIME,
  DIED_SECOND_TIME,
  DIED_THIRD_TIME,
  DIED_FOURTH_TIME,
  GPU_PROCESS_LIFETIME_EVENT_MAX = 100
};

// Indexed by GpuProcessKind. There is one of each kind maximum. This array may
// only be accessed from the IO thread.
GpuProcessHost* g_gpu_process_hosts[GpuProcessHost::GPU_PROCESS_KIND_COUNT];


void SendGpuProcessMessage(GpuProcessHost::GpuProcessKind kind,
                           CauseForGpuLaunch cause,
                           IPC::Message* message) {
  GpuProcessHost* host = GpuProcessHost::Get(kind, cause);
  if (host) {
    host->Send(message);
  } else {
    delete message;
  }
}

void AcceleratedSurfaceBuffersSwappedCompletedForGPU(
    int host_id,
    int route_id,
    bool alive,
    base::TimeTicks vsync_timebase,
    base::TimeDelta vsync_interval) {
  if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
    BrowserThread::PostTask(
        BrowserThread::IO,
        FROM_HERE,
        base::Bind(&AcceleratedSurfaceBuffersSwappedCompletedForGPU,
                   host_id,
                   route_id,
                   alive,
                   vsync_timebase,
                   vsync_interval));
    return;
  }

  GpuProcessHost* host = GpuProcessHost::FromID(host_id);
  if (host) {
    if (alive) {
      AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
      ack_params.sync_point = 0;
#if defined(OS_WIN)
      ack_params.vsync_timebase = vsync_timebase;
      ack_params.vsync_interval = vsync_interval;
#endif
      host->Send(
          new AcceleratedSurfaceMsg_BufferPresented(route_id, ack_params));
    } else {
      host->ForceShutdown();
    }
  }
}

#if defined(OS_WIN)
// This sends a ViewMsg_SwapBuffers_ACK directly to the renderer process
// (RenderWidget).
void AcceleratedSurfaceBuffersSwappedCompletedForRenderer(
    int surface_id,
    base::TimeTicks timebase,
    base::TimeDelta interval,
    const std::vector<ui::LatencyInfo>& latency_info) {
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    BrowserThread::PostTask(
        BrowserThread::UI,
        FROM_HERE,
        base::Bind(&AcceleratedSurfaceBuffersSwappedCompletedForRenderer,
                   surface_id, timebase, interval, latency_info));
    return;
  }

  int render_process_id = 0;
  int render_widget_id = 0;
  if (!GpuSurfaceTracker::Get()->GetRenderWidgetIDForSurface(
      surface_id, &render_process_id, &render_widget_id)) {
    RenderWidgetHostImpl::CompositorFrameDrawn(latency_info);
    return;
  }
  RenderWidgetHost* rwh =
    RenderWidgetHost::FromID(render_process_id, render_widget_id);
  if (!rwh)
    return;
  RenderWidgetHostImpl::From(rwh)->AcknowledgeSwapBuffersToRenderer();
  if (interval != base::TimeDelta())
    RenderWidgetHostImpl::From(rwh)->UpdateVSyncParameters(timebase, interval);
  for (size_t i = 0; i < latency_info.size(); i++)
    RenderWidgetHostImpl::From(rwh)->FrameSwapped(latency_info[i]);
  RenderWidgetHostImpl::From(rwh)->DidReceiveRendererFrame();
}

void AcceleratedSurfaceBuffersSwappedCompleted(
    int host_id,
    int route_id,
    int surface_id,
    bool alive,
    base::TimeTicks timebase,
    base::TimeDelta interval,
    const std::vector<ui::LatencyInfo>& latency_info) {
  AcceleratedSurfaceBuffersSwappedCompletedForGPU(
      host_id, route_id, alive, timebase, interval);
  AcceleratedSurfaceBuffersSwappedCompletedForRenderer(
      surface_id, timebase, interval, latency_info);
}
#endif  // OS_WIN

// NOTE: changes to this class need to be reviewed by the security team.
class GpuSandboxedProcessLauncherDelegate
    : public SandboxedProcessLauncherDelegate {
 public:
  GpuSandboxedProcessLauncherDelegate(CommandLine* cmd_line,
                                      ChildProcessHost* host)
#if defined(OS_WIN)
      : cmd_line_(cmd_line) {}
#elif defined(OS_POSIX)
      : ipc_fd_(host->TakeClientFileDescriptor()) {}
#endif

  virtual ~GpuSandboxedProcessLauncherDelegate() {}

#if defined(OS_WIN)
  virtual bool ShouldSandbox() OVERRIDE {
    bool sandbox = !cmd_line_->HasSwitch(switches::kDisableGpuSandbox);
    if(! sandbox) {
      DVLOG(1) << "GPU sandbox is disabled";
    }
    return sandbox;
  }

  virtual void PreSandbox(bool* disable_default_policy,
                          base::FilePath* exposed_dir) OVERRIDE {
    *disable_default_policy = true;
  }

  // For the GPU process we gotten as far as USER_LIMITED. The next level
  // which is USER_RESTRICTED breaks both the DirectX backend and the OpenGL
  // backend. Note that the GPU process is connected to the interactive
  // desktop.
  virtual void PreSpawnTarget(sandbox::TargetPolicy* policy,
                              bool* success) {
    if (base::win::GetVersion() > base::win::VERSION_XP) {
      if (cmd_line_->GetSwitchValueASCII(switches::kUseGL) ==
          gfx::kGLImplementationDesktopName) {
        // Open GL path.
        policy->SetTokenLevel(sandbox::USER_RESTRICTED_SAME_ACCESS,
                              sandbox::USER_LIMITED);
        SetJobLevel(*cmd_line_, sandbox::JOB_UNPROTECTED, 0, policy);
        policy->SetDelayedIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW);
      } else {
        policy->SetTokenLevel(sandbox::USER_RESTRICTED_SAME_ACCESS,
                              sandbox::USER_LIMITED);

        // UI restrictions break when we access Windows from outside our job.
        // However, we don't want a proxy window in this process because it can
        // introduce deadlocks where the renderer blocks on the gpu, which in
        // turn blocks on the browser UI thread. So, instead we forgo a window
        // message pump entirely and just add job restrictions to prevent child
        // processes.
        SetJobLevel(*cmd_line_,
                    sandbox::JOB_LIMITED_USER,
                    JOB_OBJECT_UILIMIT_SYSTEMPARAMETERS |
                    JOB_OBJECT_UILIMIT_DESKTOP |
                    JOB_OBJECT_UILIMIT_EXITWINDOWS |
                    JOB_OBJECT_UILIMIT_DISPLAYSETTINGS,
                    policy);

        policy->SetIntegrityLevel(sandbox::INTEGRITY_LEVEL_LOW);
      }
    } else {
      SetJobLevel(*cmd_line_, sandbox::JOB_UNPROTECTED, 0, policy);
      policy->SetTokenLevel(sandbox::USER_UNPROTECTED,
                            sandbox::USER_LIMITED);
    }

    // Allow the server side of GPU sockets, which are pipes that have
    // the "chrome.gpu" namespace and an arbitrary suffix.
    sandbox::ResultCode result = policy->AddRule(
        sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
        sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
        L"\\\\.\\pipe\\chrome.gpu.*");
    if (result != sandbox::SBOX_ALL_OK) {
      *success = false;
      return;
    }

    // Block this DLL even if it is not loaded by the browser process.
    policy->AddDllToUnload(L"cmsetac.dll");

#ifdef USE_AURA
    // GPU also needs to add sections to the browser for aura
    // TODO(jschuh): refactor the GPU channel to remove this. crbug.com/128786
    result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_HANDLES,
                             sandbox::TargetPolicy::HANDLES_DUP_BROKER,
                             L"Section");
    if (result != sandbox::SBOX_ALL_OK) {
      *success = false;
      return;
    }
#endif

    if (cmd_line_->HasSwitch(switches::kEnableLogging)) {
      base::string16 log_file_path = logging::GetLogFileFullPath();
      if (!log_file_path.empty()) {
        result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES,
                                 sandbox::TargetPolicy::FILES_ALLOW_ANY,
                                 log_file_path.c_str());
        if (result != sandbox::SBOX_ALL_OK) {
          *success = false;
          return;
        }
      }
    }
  }
#elif defined(OS_POSIX)

  virtual int GetIpcFd() OVERRIDE {
    return ipc_fd_;
  }
#endif  // OS_WIN

 private:
#if defined(OS_WIN)
  CommandLine* cmd_line_;
#elif defined(OS_POSIX)
  int ipc_fd_;
#endif  // OS_WIN
};

}  // anonymous namespace

// static
bool GpuProcessHost::ValidateHost(GpuProcessHost* host) {
  // The Gpu process is invalid if it's not using SwiftShader, the card is
  // blacklisted, and we can kill it and start over.
  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess) ||
      CommandLine::ForCurrentProcess()->HasSwitch(switches::kInProcessGPU) ||
      (host->valid_ &&
       (host->swiftshader_rendering_ ||
        !GpuDataManagerImpl::GetInstance()->ShouldUseSwiftShader()))) {
    return true;
  }

  host->ForceShutdown();
  return false;
}

// static
GpuProcessHost* GpuProcessHost::Get(GpuProcessKind kind,
                                    CauseForGpuLaunch cause) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

  // Don't grant further access to GPU if it is not allowed.
  GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
  DCHECK(gpu_data_manager);
  if (!gpu_data_manager->GpuAccessAllowed(NULL))
    return NULL;

  if (g_gpu_process_hosts[kind] && ValidateHost(g_gpu_process_hosts[kind]))
    return g_gpu_process_hosts[kind];

  if (cause == CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH)
    return NULL;

  static int last_host_id = 0;
  int host_id;
  host_id = ++last_host_id;

  UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLaunchCause",
                            cause,
                            CAUSE_FOR_GPU_LAUNCH_MAX_ENUM);

  GpuProcessHost* host = new GpuProcessHost(host_id, kind);
  if (host->Init())
    return host;

  delete host;
  return NULL;
}

// static
void GpuProcessHost::GetProcessHandles(
    const GpuDataManager::GetGpuProcessHandlesCallback& callback)  {
  if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
    BrowserThread::PostTask(
        BrowserThread::IO,
        FROM_HERE,
        base::Bind(&GpuProcessHost::GetProcessHandles, callback));
    return;
  }
  std::list<base::ProcessHandle> handles;
  for (size_t i = 0; i < arraysize(g_gpu_process_hosts); ++i) {
    GpuProcessHost* host = g_gpu_process_hosts[i];
    if (host && ValidateHost(host))
      handles.push_back(host->process_->GetHandle());
  }
  BrowserThread::PostTask(
      BrowserThread::UI,
      FROM_HERE,
      base::Bind(callback, handles));
}

// static
void GpuProcessHost::SendOnIO(GpuProcessKind kind,
                              CauseForGpuLaunch cause,
                              IPC::Message* message) {
  if (!BrowserThread::PostTask(
          BrowserThread::IO, FROM_HERE,
          base::Bind(
              &SendGpuProcessMessage, kind, cause, message))) {
    delete message;
  }
}

GpuMainThreadFactoryFunction g_gpu_main_thread_factory = NULL;

void GpuProcessHost::RegisterGpuMainThreadFactory(
    GpuMainThreadFactoryFunction create) {
  g_gpu_main_thread_factory = create;
}

// static
GpuProcessHost* GpuProcessHost::FromID(int host_id) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

  for (int i = 0; i < GPU_PROCESS_KIND_COUNT; ++i) {
    GpuProcessHost* host = g_gpu_process_hosts[i];
    if (host && host->host_id_ == host_id && ValidateHost(host))
      return host;
  }

  return NULL;
}

GpuProcessHost::GpuProcessHost(int host_id, GpuProcessKind kind)
    : host_id_(host_id),
      valid_(true),
      in_process_(false),
      swiftshader_rendering_(false),
      kind_(kind),
      process_launched_(false),
      initialized_(false),
      uma_memory_stats_received_(false) {
  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess) ||
      CommandLine::ForCurrentProcess()->HasSwitch(switches::kInProcessGPU)) {
    in_process_ = true;
  }

  // If the 'single GPU process' policy ever changes, we still want to maintain
  // it for 'gpu thread' mode and only create one instance of host and thread.
  DCHECK(!in_process_ || g_gpu_process_hosts[kind] == NULL);

  g_gpu_process_hosts[kind] = this;

  // Post a task to create the corresponding GpuProcessHostUIShim.  The
  // GpuProcessHostUIShim will be destroyed if either the browser exits,
  // in which case it calls GpuProcessHostUIShim::DestroyAll, or the
  // GpuProcessHost is destroyed, which happens when the corresponding GPU
  // process terminates or fails to launch.
  BrowserThread::PostTask(
      BrowserThread::UI,
      FROM_HERE,
      base::Bind(base::IgnoreResult(&GpuProcessHostUIShim::Create), host_id));

  process_.reset(new BrowserChildProcessHostImpl(PROCESS_TYPE_GPU, this));
}

GpuProcessHost::~GpuProcessHost() {
  DCHECK(CalledOnValidThread());

  SendOutstandingReplies();

  // Maximum number of times the gpu process is allowed to crash in a session.
  // Once this limit is reached, any request to launch the gpu process will
  // fail.
  const int kGpuMaxCrashCount = 3;

  // Number of times the gpu process has crashed in the current browser session.
  static int gpu_crash_count = 0;
  static int gpu_recent_crash_count = 0;
  static base::Time last_gpu_crash_time;
  static bool crashed_before = false;
  static int swiftshader_crash_count = 0;

  bool disable_crash_limit = CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kDisableGpuProcessCrashLimit);

  // Ending only acts as a failure if the GPU process was actually started and
  // was intended for actual rendering (and not just checking caps or other
  // options).
  if (process_launched_ && kind_ == GPU_PROCESS_KIND_SANDBOXED) {
    if (swiftshader_rendering_) {
      UMA_HISTOGRAM_ENUMERATION("GPU.SwiftShaderLifetimeEvents",
                                DIED_FIRST_TIME + swiftshader_crash_count,
                                GPU_PROCESS_LIFETIME_EVENT_MAX);

      if (++swiftshader_crash_count >= kGpuMaxCrashCount &&
          !disable_crash_limit) {
        // SwiftShader is too unstable to use. Disable it for current session.
        gpu_enabled_ = false;
      }
    } else {
      ++gpu_crash_count;
      UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
                                std::min(DIED_FIRST_TIME + gpu_crash_count,
                                         GPU_PROCESS_LIFETIME_EVENT_MAX - 1),
                                GPU_PROCESS_LIFETIME_EVENT_MAX);

      // Allow about 1 GPU crash per hour to be removed from the crash count,
      // so very occasional crashes won't eventually add up and prevent the
      // GPU process from launching.
      ++gpu_recent_crash_count;
      base::Time current_time = base::Time::Now();
      if (crashed_before) {
        int hours_different = (current_time - last_gpu_crash_time).InHours();
        gpu_recent_crash_count =
            std::max(0, gpu_recent_crash_count - hours_different);
      }

      crashed_before = true;
      last_gpu_crash_time = current_time;

      if ((gpu_recent_crash_count >= kGpuMaxCrashCount && !disable_crash_limit)
          || !initialized_) {
#if !defined(OS_CHROMEOS)
        // The gpu process is too unstable to use. Disable it for current
        // session.
        hardware_gpu_enabled_ = false;
        GpuDataManagerImpl::GetInstance()->DisableHardwareAcceleration();
#endif
      }
    }
  }

  // In case we never started, clean up.
  while (!queued_messages_.empty()) {
    delete queued_messages_.front();
    queued_messages_.pop();
  }

  // This is only called on the IO thread so no race against the constructor
  // for another GpuProcessHost.
  if (g_gpu_process_hosts[kind_] == this)
    g_gpu_process_hosts[kind_] = NULL;

  // If there are any remaining offscreen contexts at the point the
  // GPU process exits, assume something went wrong, and block their
  // URLs from accessing client 3D APIs without prompting.
  BlockLiveOffscreenContexts();

  UMA_HISTOGRAM_COUNTS_100("GPU.AtExitSurfaceCount",
                           GpuSurfaceTracker::Get()->GetSurfaceCount());
  UMA_HISTOGRAM_BOOLEAN("GPU.AtExitReceivedMemoryStats",
                        uma_memory_stats_received_);

  if (uma_memory_stats_received_) {
    UMA_HISTOGRAM_COUNTS_100("GPU.AtExitManagedMemoryClientCount",
                             uma_memory_stats_.client_count);
    UMA_HISTOGRAM_COUNTS_100("GPU.AtExitContextGroupCount",
                             uma_memory_stats_.context_group_count);
    UMA_HISTOGRAM_CUSTOM_COUNTS(
        "GPU.AtExitMBytesAllocated",
        uma_memory_stats_.bytes_allocated_current / 1024 / 1024, 1, 2000, 50);
    UMA_HISTOGRAM_CUSTOM_COUNTS(
        "GPU.AtExitMBytesAllocatedMax",
        uma_memory_stats_.bytes_allocated_max / 1024 / 1024, 1, 2000, 50);
    UMA_HISTOGRAM_CUSTOM_COUNTS(
        "GPU.AtExitMBytesLimit",
        uma_memory_stats_.bytes_limit / 1024 / 1024, 1, 2000, 50);
  }

  std::string message;
  if (!in_process_) {
    int exit_code;
    base::TerminationStatus status = process_->GetTerminationStatus(
        false /* known_dead */, &exit_code);
    UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessTerminationStatus",
                              status,
                              base::TERMINATION_STATUS_MAX_ENUM);

    if (status == base::TERMINATION_STATUS_NORMAL_TERMINATION ||
        status == base::TERMINATION_STATUS_ABNORMAL_TERMINATION) {
      UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessExitCode",
                                exit_code,
                                RESULT_CODE_LAST_CODE);
    }

    switch (status) {
      case base::TERMINATION_STATUS_NORMAL_TERMINATION:
        message = "The GPU process exited normally. Everything is okay.";
        break;
      case base::TERMINATION_STATUS_ABNORMAL_TERMINATION:
        message = base::StringPrintf(
            "The GPU process exited with code %d.",
            exit_code);
        break;
      case base::TERMINATION_STATUS_PROCESS_WAS_KILLED:
        message = "You killed the GPU process! Why?";
        break;
      case base::TERMINATION_STATUS_PROCESS_CRASHED:
        message = "The GPU process crashed!";
        break;
      default:
        break;
    }
  }

  BrowserThread::PostTask(BrowserThread::UI,
                          FROM_HERE,
                          base::Bind(&GpuProcessHostUIShim::Destroy,
                                     host_id_,
                                     message));
}

bool GpuProcessHost::Init() {
  init_start_time_ = base::TimeTicks::Now();

  TRACE_EVENT_INSTANT0("gpu", "LaunchGpuProcess", TRACE_EVENT_SCOPE_THREAD);

  std::string channel_id = process_->GetHost()->CreateChannel();
  if (channel_id.empty())
    return false;

  if (in_process_) {
    DCHECK(g_gpu_main_thread_factory);
    CommandLine* command_line = CommandLine::ForCurrentProcess();
    command_line->AppendSwitch(switches::kDisableGpuWatchdog);

    GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
    DCHECK(gpu_data_manager);
    gpu_data_manager->AppendGpuCommandLine(command_line);

    in_process_gpu_thread_.reset(g_gpu_main_thread_factory(channel_id));
    in_process_gpu_thread_->Start();

    OnProcessLaunched();  // Fake a callback that the process is ready.
  } else if (!LaunchGpuProcess(channel_id)) {
    return false;
  }

  if (!Send(new GpuMsg_Initialize()))
    return false;

  return true;
}

void GpuProcessHost::RouteOnUIThread(const IPC::Message& message) {
  BrowserThread::PostTask(
      BrowserThread::UI,
      FROM_HERE,
      base::Bind(&RouteToGpuProcessHostUIShimTask, host_id_, message));
}

bool GpuProcessHost::Send(IPC::Message* msg) {
  DCHECK(CalledOnValidThread());
  if (process_->GetHost()->IsChannelOpening()) {
    queued_messages_.push(msg);
    return true;
  }

  bool result = process_->Send(msg);
  if (!result) {
    // Channel is hosed, but we may not get destroyed for a while. Send
    // outstanding channel creation failures now so that the caller can restart
    // with a new process/channel without waiting.
    SendOutstandingReplies();
  }
  return result;
}

void GpuProcessHost::AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
  DCHECK(CalledOnValidThread());
  process_->GetHost()->AddFilter(filter);
}

bool GpuProcessHost::OnMessageReceived(const IPC::Message& message) {
  DCHECK(CalledOnValidThread());
  IPC_BEGIN_MESSAGE_MAP(GpuProcessHost, message)
    IPC_MESSAGE_HANDLER(GpuHostMsg_Initialized, OnInitialized)
    IPC_MESSAGE_HANDLER(GpuHostMsg_ChannelEstablished, OnChannelEstablished)
    IPC_MESSAGE_HANDLER(GpuHostMsg_CommandBufferCreated, OnCommandBufferCreated)
    IPC_MESSAGE_HANDLER(GpuHostMsg_DestroyCommandBuffer, OnDestroyCommandBuffer)
    IPC_MESSAGE_HANDLER(GpuHostMsg_ImageCreated, OnImageCreated)
    IPC_MESSAGE_HANDLER(GpuHostMsg_DidCreateOffscreenContext,
                        OnDidCreateOffscreenContext)
    IPC_MESSAGE_HANDLER(GpuHostMsg_DidLoseContext, OnDidLoseContext)
    IPC_MESSAGE_HANDLER(GpuHostMsg_DidDestroyOffscreenContext,
                        OnDidDestroyOffscreenContext)
    IPC_MESSAGE_HANDLER(GpuHostMsg_GpuMemoryUmaStats,
                        OnGpuMemoryUmaStatsReceived)
#if defined(OS_MACOSX)
    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                        OnAcceleratedSurfaceBuffersSwapped)
#endif
#if defined(OS_WIN)
    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceBuffersSwapped,
                        OnAcceleratedSurfaceBuffersSwapped)
    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfacePostSubBuffer,
                        OnAcceleratedSurfacePostSubBuffer)
    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceSuspend,
                        OnAcceleratedSurfaceSuspend)
    IPC_MESSAGE_HANDLER(GpuHostMsg_AcceleratedSurfaceRelease,
                        OnAcceleratedSurfaceRelease)
#endif
    IPC_MESSAGE_HANDLER(GpuHostMsg_DestroyChannel,
                        OnDestroyChannel)
    IPC_MESSAGE_HANDLER(GpuHostMsg_CacheShader,
                        OnCacheShader)

    IPC_MESSAGE_UNHANDLED(RouteOnUIThread(message))
  IPC_END_MESSAGE_MAP()

  return true;
}

void GpuProcessHost::OnChannelConnected(int32 peer_pid) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnChannelConnected");

  while (!queued_messages_.empty()) {
    Send(queued_messages_.front());
    queued_messages_.pop();
  }
}

void GpuProcessHost::EstablishGpuChannel(
    int client_id,
    bool share_context,
    const EstablishChannelCallback& callback) {
  DCHECK(CalledOnValidThread());
  TRACE_EVENT0("gpu", "GpuProcessHost::EstablishGpuChannel");

  // If GPU features are already blacklisted, no need to establish the channel.
  if (!GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL)) {
    DVLOG(1) << "GPU blacklisted, refusing to open a GPU channel.";
    callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
    return;
  }

  if (Send(new GpuMsg_EstablishChannel(client_id, share_context))) {
    channel_requests_.push(callback);
  } else {
    DVLOG(1) << "Failed to send GpuMsg_EstablishChannel.";
    callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
  }

  if (!CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kDisableGpuShaderDiskCache)) {
    CreateChannelCache(client_id);
  }
}

void GpuProcessHost::CreateViewCommandBuffer(
    const gfx::GLSurfaceHandle& compositing_surface,
    int surface_id,
    int client_id,
    const GPUCreateCommandBufferConfig& init_params,
    const CreateCommandBufferCallback& callback) {
  TRACE_EVENT0("gpu", "GpuProcessHost::CreateViewCommandBuffer");

  DCHECK(CalledOnValidThread());

  if (!compositing_surface.is_null() &&
      Send(new GpuMsg_CreateViewCommandBuffer(
          compositing_surface, surface_id, client_id, init_params))) {
    create_command_buffer_requests_.push(callback);
    surface_refs_.insert(std::make_pair(surface_id,
        GpuSurfaceTracker::GetInstance()->GetSurfaceRefForSurface(surface_id)));
  } else {
    callback.Run(MSG_ROUTING_NONE);
  }
}

void GpuProcessHost::CreateImage(gfx::PluginWindowHandle window,
                                 int client_id,
                                 int image_id,
                                 const CreateImageCallback& callback) {
  TRACE_EVENT0("gpu", "GpuProcessHost::CreateImage");

  DCHECK(CalledOnValidThread());

  if (Send(new GpuMsg_CreateImage(window, client_id, image_id))) {
    create_image_requests_.push(callback);
  } else {
    callback.Run(gfx::Size());
  }
}

void GpuProcessHost::DeleteImage(int client_id,
                                 int image_id,
                                 int sync_point) {
  TRACE_EVENT0("gpu", "GpuProcessHost::DeleteImage");

  DCHECK(CalledOnValidThread());

  Send(new GpuMsg_DeleteImage(client_id, image_id, sync_point));
}

void GpuProcessHost::OnInitialized(bool result, const gpu::GPUInfo& gpu_info) {
  UMA_HISTOGRAM_BOOLEAN("GPU.GPUProcessInitialized", result);
  initialized_ = result;

  if (!initialized_)
    GpuDataManagerImpl::GetInstance()->OnGpuProcessInitFailure();
  else if (!in_process_)
    GpuDataManagerImpl::GetInstance()->UpdateGpuInfo(gpu_info);
}

void GpuProcessHost::OnChannelEstablished(
    const IPC::ChannelHandle& channel_handle) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnChannelEstablished");

  if (channel_requests_.empty()) {
    // This happens when GPU process is compromised.
    RouteOnUIThread(GpuHostMsg_OnLogMessage(
        logging::LOG_WARNING,
        "WARNING",
        "Received a ChannelEstablished message but no requests in queue."));
    return;
  }
  EstablishChannelCallback callback = channel_requests_.front();
  channel_requests_.pop();

  // Currently if any of the GPU features are blacklisted, we don't establish a
  // GPU channel.
  if (!channel_handle.name.empty() &&
      !GpuDataManagerImpl::GetInstance()->GpuAccessAllowed(NULL)) {
    Send(new GpuMsg_CloseChannel(channel_handle));
    callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
    RouteOnUIThread(GpuHostMsg_OnLogMessage(
        logging::LOG_WARNING,
        "WARNING",
        "Hardware acceleration is unavailable."));
    return;
  }

  callback.Run(channel_handle,
               GpuDataManagerImpl::GetInstance()->GetGPUInfo());
}

void GpuProcessHost::OnCommandBufferCreated(const int32 route_id) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnCommandBufferCreated");

  if (create_command_buffer_requests_.empty())
    return;

  CreateCommandBufferCallback callback =
      create_command_buffer_requests_.front();
  create_command_buffer_requests_.pop();
  callback.Run(route_id);
}

void GpuProcessHost::OnDestroyCommandBuffer(int32 surface_id) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnDestroyCommandBuffer");
  SurfaceRefMap::iterator it = surface_refs_.find(surface_id);
  if (it != surface_refs_.end()) {
    surface_refs_.erase(it);
  }
}

void GpuProcessHost::OnImageCreated(const gfx::Size size) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnImageCreated");

  if (create_image_requests_.empty())
    return;

  CreateImageCallback callback = create_image_requests_.front();
  create_image_requests_.pop();
  callback.Run(size);
}

void GpuProcessHost::OnDidCreateOffscreenContext(const GURL& url) {
  urls_with_live_offscreen_contexts_.insert(url);
}

void GpuProcessHost::OnDidLoseContext(bool offscreen,
                                      gpu::error::ContextLostReason reason,
                                      const GURL& url) {
  // TODO(kbr): would be nice to see the "offscreen" flag too.
  TRACE_EVENT2("gpu", "GpuProcessHost::OnDidLoseContext",
               "reason", reason,
               "url",
               url.possibly_invalid_spec());

  if (!offscreen || url.is_empty()) {
    // Assume that the loss of the compositor's or accelerated canvas'
    // context is a serious event and blame the loss on all live
    // offscreen contexts. This more robustly handles situations where
    // the GPU process may not actually detect the context loss in the
    // offscreen context.
    BlockLiveOffscreenContexts();
    return;
  }

  GpuDataManagerImpl::DomainGuilt guilt;
  switch (reason) {
    case gpu::error::kGuilty:
      guilt = GpuDataManagerImpl::DOMAIN_GUILT_KNOWN;
      break;
    case gpu::error::kUnknown:
      guilt = GpuDataManagerImpl::DOMAIN_GUILT_UNKNOWN;
      break;
    case gpu::error::kInnocent:
      return;
    default:
      NOTREACHED();
      return;
  }

  GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(url, guilt);
}

void GpuProcessHost::OnDidDestroyOffscreenContext(const GURL& url) {
  urls_with_live_offscreen_contexts_.erase(url);
}

void GpuProcessHost::OnGpuMemoryUmaStatsReceived(
    const GPUMemoryUmaStats& stats) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnGpuMemoryUmaStatsReceived");
  uma_memory_stats_received_ = true;
  uma_memory_stats_ = stats;
}

#if defined(OS_MACOSX)
void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped");

  if (!ui::LatencyInfo::Verify(params.latency_info,
                               "GpuHostMsg_AcceleratedSurfaceBuffersSwapped"))
    return;

  gfx::GLSurfaceHandle surface_handle =
      GpuSurfaceTracker::Get()->GetSurfaceHandle(params.surface_id);
  // Compositor window is always gfx::kNullPluginWindow.
  // TODO(jbates) http://crbug.com/105344 This will be removed when there are no
  // plugin windows.
  if (surface_handle.handle != gfx::kNullPluginWindow ||
      surface_handle.transport_type == gfx::TEXTURE_TRANSPORT) {
    RouteOnUIThread(GpuHostMsg_AcceleratedSurfaceBuffersSwapped(params));
    return;
  }

  base::ScopedClosureRunner scoped_completion_runner(
      base::Bind(&AcceleratedSurfaceBuffersSwappedCompletedForGPU,
                 host_id_, params.route_id,
                 true /* alive */, base::TimeTicks(), base::TimeDelta()));

  int render_process_id = 0;
  int render_widget_id = 0;
  if (!GpuSurfaceTracker::Get()->GetRenderWidgetIDForSurface(
      params.surface_id, &render_process_id, &render_widget_id)) {
    return;
  }
  RenderWidgetHelper* helper =
      RenderWidgetHelper::FromProcessHostID(render_process_id);
  if (!helper)
    return;

  // Pass the SwapBuffers on to the RenderWidgetHelper to wake up the UI thread
  // if the browser is waiting for a new frame. Otherwise the RenderWidgetHelper
  // will forward to the RenderWidgetHostView via RenderProcessHostImpl and
  // RenderWidgetHostImpl.
  ignore_result(scoped_completion_runner.Release());

  ViewHostMsg_CompositorSurfaceBuffersSwapped_Params view_params;
  view_params.surface_id = params.surface_id;
  view_params.surface_handle = params.surface_handle;
  view_params.route_id = params.route_id;
  view_params.size = params.size;
  view_params.scale_factor = params.scale_factor;
  view_params.gpu_process_host_id = host_id_;
  view_params.latency_info = params.latency_info;
  helper->DidReceiveBackingStoreMsg(ViewHostMsg_CompositorSurfaceBuffersSwapped(
      render_widget_id,
      view_params));
}
#endif  // OS_MACOSX

#if defined(OS_WIN)
void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped");

  if (!ui::LatencyInfo::Verify(params.latency_info,
                               "GpuHostMsg_AcceleratedSurfaceBuffersSwapped"))
    return;

  base::ScopedClosureRunner scoped_completion_runner(
      base::Bind(&AcceleratedSurfaceBuffersSwappedCompleted,
          host_id_, params.route_id, params.surface_id,
          true, base::TimeTicks(), base::TimeDelta(),
          std::vector<ui::LatencyInfo>()));

  gfx::GLSurfaceHandle handle =
      GpuSurfaceTracker::Get()->GetSurfaceHandle(params.surface_id);

  if (handle.is_null())
    return;

  if (handle.transport_type == gfx::TEXTURE_TRANSPORT) {
    TRACE_EVENT1("gpu", "SurfaceIDNotFound_RoutingToUI",
                 "surface_id", params.surface_id);
    // This is a content area swap, send it on to the UI thread.
    ignore_result(scoped_completion_runner.Release());
    RouteOnUIThread(GpuHostMsg_AcceleratedSurfaceBuffersSwapped(params));
    return;
  }

  TRACE_EVENT1("gpu",
               "EarlyOut_NativeWindowNotFound",
               "handle",
               handle.handle);
  ignore_result(scoped_completion_runner.Release());
  AcceleratedSurfaceBuffersSwappedCompleted(host_id_,
                                            params.route_id,
                                            params.surface_id,
                                            true,
                                            base::TimeTicks(),
                                            base::TimeDelta(),
                                            params.latency_info);
}

void GpuProcessHost::OnAcceleratedSurfacePostSubBuffer(
    const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfacePostSubBuffer");

  if (!ui::LatencyInfo::Verify(params.latency_info,
                               "GpuHostMsg_AcceleratedSurfacePostSubBuffer"))
    return;

  NOTIMPLEMENTED();
}

void GpuProcessHost::OnAcceleratedSurfaceSuspend(int32 surface_id) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceSuspend");

  gfx::PluginWindowHandle handle =
      GpuSurfaceTracker::Get()->GetSurfaceHandle(surface_id).handle;

  if (!handle) {
#if defined(USE_AURA)
    RouteOnUIThread(GpuHostMsg_AcceleratedSurfaceSuspend(surface_id));
#endif
    return;
  }
}

void GpuProcessHost::OnAcceleratedSurfaceRelease(
    const GpuHostMsg_AcceleratedSurfaceRelease_Params& params) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceRelease");

  gfx::PluginWindowHandle handle =
      GpuSurfaceTracker::Get()->GetSurfaceHandle(params.surface_id).handle;
  if (!handle) {
#if defined(USE_AURA)
    RouteOnUIThread(GpuHostMsg_AcceleratedSurfaceRelease(params));
    return;
#endif
  }
}

#endif  // OS_WIN

void GpuProcessHost::OnProcessLaunched() {
  UMA_HISTOGRAM_TIMES("GPU.GPUProcessLaunchTime",
                      base::TimeTicks::Now() - init_start_time_);
}

void GpuProcessHost::OnProcessCrashed(int exit_code) {
  SendOutstandingReplies();
  GpuDataManagerImpl::GetInstance()->ProcessCrashed(
      process_->GetTerminationStatus(true /* known_dead */, NULL));
}

GpuProcessHost::GpuProcessKind GpuProcessHost::kind() {
  return kind_;
}

void GpuProcessHost::ForceShutdown() {
  // This is only called on the IO thread so no race against the constructor
  // for another GpuProcessHost.
  if (g_gpu_process_hosts[kind_] == this)
    g_gpu_process_hosts[kind_] = NULL;

  process_->ForceShutdown();
}

void GpuProcessHost::BeginFrameSubscription(
    int surface_id,
    base::WeakPtr<RenderWidgetHostViewFrameSubscriber> subscriber) {
  frame_subscribers_[surface_id] = subscriber;
}

void GpuProcessHost::EndFrameSubscription(int surface_id) {
  frame_subscribers_.erase(surface_id);
}

bool GpuProcessHost::LaunchGpuProcess(const std::string& channel_id) {
  if (!(gpu_enabled_ &&
      GpuDataManagerImpl::GetInstance()->ShouldUseSwiftShader()) &&
      !hardware_gpu_enabled_) {
    SendOutstandingReplies();
    return false;
  }

  const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();

  CommandLine::StringType gpu_launcher =
      browser_command_line.GetSwitchValueNative(switches::kGpuLauncher);

#if defined(OS_LINUX)
  int child_flags = gpu_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
                                           ChildProcessHost::CHILD_NORMAL;
#else
  int child_flags = ChildProcessHost::CHILD_NORMAL;
#endif

  base::FilePath exe_path = ChildProcessHost::GetChildPath(child_flags);
  if (exe_path.empty())
    return false;

  CommandLine* cmd_line = new CommandLine(exe_path);
  cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
  cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);

  if (kind_ == GPU_PROCESS_KIND_UNSANDBOXED)
    cmd_line->AppendSwitch(switches::kDisableGpuSandbox);

  // Propagate relevant command line switches.
  static const char* const kSwitchNames[] = {
    switches::kDisableAcceleratedVideoDecode,
    switches::kDisableBreakpad,
    switches::kDisableGLDrawingForTests,
    switches::kDisableGpuSandbox,
    switches::kDisableGpuWatchdog,
    switches::kDisableLogging,
    switches::kDisableSeccompFilterSandbox,
#if defined(ENABLE_WEBRTC)
    switches::kDisableWebRtcHWEncoding,
#endif
    switches::kEnableLogging,
    switches::kEnableShareGroupAsyncTextureUpload,
    switches::kGpuStartupDialog,
    switches::kGpuSandboxAllowSysVShm,
    switches::kGpuSandboxFailuresFatal,
    switches::kGpuSandboxStartAfterInitialization,
    switches::kLoggingLevel,
    switches::kNoSandbox,
    switches::kTestGLLib,
    switches::kTraceStartup,
    switches::kV,
    switches::kVModule,
#if defined(OS_MACOSX)
    switches::kEnableSandboxLogging,
#endif
#if defined(USE_AURA)
    switches::kUIPrioritizeInGpuProcess,
#endif
#if defined(USE_OZONE)
    switches::kOzonePlatform,
#endif
#if defined(OS_WIN)
    switches::kHighDPISupport,
#endif
  };
  cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
                             arraysize(kSwitchNames));
  cmd_line->CopySwitchesFrom(
      browser_command_line, switches::kGpuSwitches, switches::kNumGpuSwitches);
  cmd_line->CopySwitchesFrom(
      browser_command_line, switches::kGLSwitchesCopiedFromGpuProcessHost,
      switches::kGLSwitchesCopiedFromGpuProcessHostNumSwitches);

  GetContentClient()->browser()->AppendExtraCommandLineSwitches(
      cmd_line, process_->GetData().id);

  GpuDataManagerImpl::GetInstance()->AppendGpuCommandLine(cmd_line);

  if (cmd_line->HasSwitch(switches::kUseGL)) {
    swiftshader_rendering_ =
        (cmd_line->GetSwitchValueASCII(switches::kUseGL) == "swiftshader");
  }

  UMA_HISTOGRAM_BOOLEAN("GPU.GPU.GPUProcessSoftwareRendering",
                        swiftshader_rendering_);

  // If specified, prepend a launcher program to the command line.
  if (!gpu_launcher.empty())
    cmd_line->PrependWrapper(gpu_launcher);

  process_->Launch(
      new GpuSandboxedProcessLauncherDelegate(cmd_line,
                                              process_->GetHost()),
      cmd_line);
  process_launched_ = true;

  UMA_HISTOGRAM_ENUMERATION("GPU.GPUProcessLifetimeEvents",
                            LAUNCHED, GPU_PROCESS_LIFETIME_EVENT_MAX);
  return true;
}

void GpuProcessHost::SendOutstandingReplies() {
  valid_ = false;
  // First send empty channel handles for all EstablishChannel requests.
  while (!channel_requests_.empty()) {
    EstablishChannelCallback callback = channel_requests_.front();
    channel_requests_.pop();
    callback.Run(IPC::ChannelHandle(), gpu::GPUInfo());
  }

  while (!create_command_buffer_requests_.empty()) {
    CreateCommandBufferCallback callback =
        create_command_buffer_requests_.front();
    create_command_buffer_requests_.pop();
    callback.Run(MSG_ROUTING_NONE);
  }
}

void GpuProcessHost::BlockLiveOffscreenContexts() {
  for (std::multiset<GURL>::iterator iter =
           urls_with_live_offscreen_contexts_.begin();
       iter != urls_with_live_offscreen_contexts_.end(); ++iter) {
    GpuDataManagerImpl::GetInstance()->BlockDomainFrom3DAPIs(
        *iter, GpuDataManagerImpl::DOMAIN_GUILT_UNKNOWN);
  }
}

std::string GpuProcessHost::GetShaderPrefixKey() {
  if (shader_prefix_key_.empty()) {
    gpu::GPUInfo info = GpuDataManagerImpl::GetInstance()->GetGPUInfo();

    std::string in_str = GetContentClient()->GetProduct() + "-" +
        info.gl_vendor + "-" + info.gl_renderer + "-" +
        info.driver_version + "-" + info.driver_vendor;

    base::Base64Encode(base::SHA1HashString(in_str), &shader_prefix_key_);
  }

  return shader_prefix_key_;
}

void GpuProcessHost::LoadedShader(const std::string& key,
                                  const std::string& data) {
  std::string prefix = GetShaderPrefixKey();
  if (!key.compare(0, prefix.length(), prefix))
    Send(new GpuMsg_LoadedShader(data));
}

void GpuProcessHost::CreateChannelCache(int32 client_id) {
  TRACE_EVENT0("gpu", "GpuProcessHost::CreateChannelCache");

  scoped_refptr<ShaderDiskCache> cache =
      ShaderCacheFactory::GetInstance()->Get(client_id);
  if (!cache.get())
    return;

  cache->set_host_id(host_id_);

  client_id_to_shader_cache_[client_id] = cache;
}

void GpuProcessHost::OnDestroyChannel(int32 client_id) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnDestroyChannel");
  client_id_to_shader_cache_.erase(client_id);
}

void GpuProcessHost::OnCacheShader(int32 client_id,
                                   const std::string& key,
                                   const std::string& shader) {
  TRACE_EVENT0("gpu", "GpuProcessHost::OnCacheShader");
  ClientIdToShaderCacheMap::iterator iter =
      client_id_to_shader_cache_.find(client_id);
  // If the cache doesn't exist then this is an off the record profile.
  if (iter == client_id_to_shader_cache_.end())
    return;
  iter->second->Cache(GetShaderPrefixKey() + ":" + key, shader);
}

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

DEFINITIONS
