root/gpu/config/gpu_info_collector_win.cc

DEFINITIONS

1. ReadXMLFloatValue
2. RetrieveGpuPerformanceStats
3. RetrieveGpuPerformanceStatsWithHistograms
4. DisplayLinkVersion
5. IsLenovoDCuteInstalled
6. D3D11ShouldWork
7. CollectD3D11SupportOnWorkerThread
8. CollectD3D11Support
9. GetAMDVideocardType
10. CollectDriverInfoD3D
11. CollectContextGraphicsInfo
12. CollectGpuID
13. CollectBasicGraphicsInfo
14. CollectDriverInfoGL
15. MergeGPUInfo

// 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 "gpu/config/gpu_info_collector.h"

// This has to be included before windows.h.
#include "third_party/re2/re2/re2.h"

#include <windows.h>
#include <d3d9.h>
#include <d3d11.h>
#include <dxgi.h>
#include <setupapi.h>

#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/file_util.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/scoped_native_library.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread.h"
#include "base/threading/worker_pool.h"
#include "base/win/registry.h"
#include "base/win/scoped_com_initializer.h"
#include "base/win/scoped_comptr.h"
#include "base/win/windows_version.h"
#include "third_party/libxml/chromium/libxml_utils.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface_egl.h"

namespace gpu {

namespace {

// This must be kept in sync with histograms.xml.
enum DisplayLinkInstallationStatus {
  DISPLAY_LINK_NOT_INSTALLED,
  DISPLAY_LINK_7_1_OR_EARLIER,
  DISPLAY_LINK_7_2_OR_LATER,
  DISPLAY_LINK_INSTALLATION_STATUS_MAX
};

float ReadXMLFloatValue(XmlReader* reader) {
  std::string score_string;
  if (!reader->ReadElementContent(&score_string))
    return 0.0;

  double score;
  if (!base::StringToDouble(score_string, &score))
    return 0.0;

  return static_cast<float>(score);
}

GpuPerformanceStats RetrieveGpuPerformanceStats() {
  TRACE_EVENT0("gpu", "RetrieveGpuPerformanceStats");

  // If the user re-runs the assessment without restarting, the COM API
  // returns WINSAT_ASSESSMENT_STATE_NOT_AVAILABLE. Because of that and
  // http://crbug.com/124325, read the assessment result files directly.
  GpuPerformanceStats stats;

  // Get path to WinSAT results files.
  wchar_t winsat_results_path[MAX_PATH];
  DWORD size = ExpandEnvironmentStrings(
      L"%WinDir%\\Performance\\WinSAT\\DataStore\\",
      winsat_results_path, MAX_PATH);
  if (size == 0 || size > MAX_PATH) {
    LOG(ERROR) << "The path to the WinSAT results is too long: "
               << size << " chars.";
    return stats;
  }

  // Find most recent formal assessment results.
  base::FileEnumerator file_enumerator(
      base::FilePath(winsat_results_path),
      false,  // not recursive
      base::FileEnumerator::FILES,
      FILE_PATH_LITERAL("* * Formal.Assessment (*).WinSAT.xml"));

  base::FilePath current_results;
  for (base::FilePath results = file_enumerator.Next(); !results.empty();
       results = file_enumerator.Next()) {
    // The filenames start with the date and time as yyyy-mm-dd hh.mm.ss.xxx,
    // so the greatest file lexicographically is also the most recent file.
    if (base::FilePath::CompareLessIgnoreCase(current_results.value(),
                                              results.value()))
      current_results = results;
  }

  std::string current_results_string = current_results.MaybeAsASCII();
  if (current_results_string.empty()) {
    LOG(ERROR) << "Can't retrieve a valid WinSAT assessment.";
    return stats;
  }

  // Get relevant scores from results file. XML schema at:
  // http://msdn.microsoft.com/en-us/library/windows/desktop/aa969210.aspx
  XmlReader reader;
  if (!reader.LoadFile(current_results_string)) {
    LOG(ERROR) << "Could not open WinSAT results file.";
    return stats;
  }
  // Descend into <WinSAT> root element.
  if (!reader.SkipToElement() || !reader.Read()) {
    LOG(ERROR) << "Could not read WinSAT results file.";
    return stats;
  }

  // Search for <WinSPR> element containing the results.
  do {
    if (reader.NodeName() == "WinSPR")
      break;
  } while (reader.Next());
  // Descend into <WinSPR> element.
  if (!reader.Read()) {
    LOG(ERROR) << "Could not find WinSPR element in results file.";
    return stats;
  }

  // Read scores.
  for (int depth = reader.Depth(); reader.Depth() == depth; reader.Next()) {
    std::string node_name = reader.NodeName();
    if (node_name == "SystemScore")
      stats.overall = ReadXMLFloatValue(&reader);
    else if (node_name == "GraphicsScore")
      stats.graphics = ReadXMLFloatValue(&reader);
    else if (node_name == "GamingScore")
      stats.gaming = ReadXMLFloatValue(&reader);
  }

  if (stats.overall == 0.0)
    LOG(ERROR) << "Could not read overall score from assessment results.";
  if (stats.graphics == 0.0)
    LOG(ERROR) << "Could not read graphics score from assessment results.";
  if (stats.gaming == 0.0)
    LOG(ERROR) << "Could not read gaming score from assessment results.";

  return stats;
}

GpuPerformanceStats RetrieveGpuPerformanceStatsWithHistograms() {
  base::TimeTicks start_time = base::TimeTicks::Now();

  GpuPerformanceStats stats = RetrieveGpuPerformanceStats();

  UMA_HISTOGRAM_TIMES("GPU.WinSAT.ReadResultsFileTime",
                      base::TimeTicks::Now() - start_time);
  UMA_HISTOGRAM_CUSTOM_COUNTS("GPU.WinSAT.OverallScore2",
                              stats.overall * 10, 10, 200, 50);
  UMA_HISTOGRAM_CUSTOM_COUNTS("GPU.WinSAT.GraphicsScore2",
                              stats.graphics * 10, 10, 200, 50);
  UMA_HISTOGRAM_CUSTOM_COUNTS("GPU.WinSAT.GamingScore2",
                              stats.gaming * 10, 10, 200, 50);
  UMA_HISTOGRAM_BOOLEAN(
      "GPU.WinSAT.HasResults",
      stats.overall != 0.0 && stats.graphics != 0.0 && stats.gaming != 0.0);

  return stats;
}

// Returns the display link driver version or an invalid version if it is
// not installed.
Version DisplayLinkVersion() {
  base::win::RegKey key;

  if (key.Open(HKEY_LOCAL_MACHINE, L"SOFTWARE", KEY_READ | KEY_WOW64_64KEY))
    return Version();

  if (key.OpenKey(L"DisplayLink", KEY_READ | KEY_WOW64_64KEY))
    return Version();

  if (key.OpenKey(L"Core", KEY_READ | KEY_WOW64_64KEY))
    return Version();

  base::string16 version;
  if (key.ReadValue(L"Version", &version))
    return Version();

  return Version(base::UTF16ToASCII(version));
}

// Returns whether Lenovo dCute is installed.
bool IsLenovoDCuteInstalled() {
  base::win::RegKey key;

  if (key.Open(HKEY_LOCAL_MACHINE, L"SOFTWARE", KEY_READ | KEY_WOW64_64KEY))
    return false;

  if (key.OpenKey(L"Lenovo", KEY_READ | KEY_WOW64_64KEY))
    return false;

  if (key.OpenKey(L"Lenovo dCute", KEY_READ | KEY_WOW64_64KEY))
    return false;

  return true;
}

// Determines whether D3D11 won't work, either because it is not supported on
// the machine or because it is known it is likely to crash.
bool D3D11ShouldWork(const GPUInfo& gpu_info) {
  // TODO(apatrick): This is a temporary change to see what impact disabling
  // D3D11 stats collection has on Canary.
#if 1
  return false;
#else
  // Windows XP never supports D3D11. It seems to be less stable that D3D9 on
  // Vista.
  if (base::win::GetVersion() <= base::win::VERSION_VISTA)
    return false;

  // http://crbug.com/175525.
  if (gpu_info.display_link_version.IsValid())
    return false;

  return true;
#endif
}

// Collects information about the level of D3D11 support and records it in
// the UMA stats. Records no stats when D3D11 in not supported at all.
void CollectD3D11SupportOnWorkerThread() {
  TRACE_EVENT0("gpu", "CollectD3D11Support");

  typedef HRESULT (WINAPI *D3D11CreateDeviceFunc)(
      IDXGIAdapter* adapter,
      D3D_DRIVER_TYPE driver_type,
      HMODULE software,
      UINT flags,
      const D3D_FEATURE_LEVEL* feature_levels,
      UINT num_feature_levels,
      UINT sdk_version,
      ID3D11Device** device,
      D3D_FEATURE_LEVEL* feature_level,
      ID3D11DeviceContext** immediate_context);

  // This enumeration must be kept in sync with histograms.xml. Do not reorder
  // the members; always add to the end.
  enum FeatureLevel {
    FEATURE_LEVEL_UNKNOWN,
    FEATURE_LEVEL_NO_D3D11_DLL,
    FEATURE_LEVEL_NO_CREATE_DEVICE_ENTRY_POINT,
    FEATURE_LEVEL_DEVICE_CREATION_FAILED,
    FEATURE_LEVEL_9_1,
    FEATURE_LEVEL_9_2,
    FEATURE_LEVEL_9_3,
    FEATURE_LEVEL_10_0,
    FEATURE_LEVEL_10_1,
    FEATURE_LEVEL_11_0,
    NUM_FEATURE_LEVELS
  };

  FeatureLevel feature_level = FEATURE_LEVEL_UNKNOWN;
  UINT bgra_support = 0;

  // This module is leaked in case it is hooked by third party software.
  base::NativeLibrary d3d11_module = base::LoadNativeLibrary(
      base::FilePath(L"d3d11.dll"),
      NULL);

  if (!d3d11_module) {
    feature_level = FEATURE_LEVEL_NO_D3D11_DLL;
  } else {
    D3D11CreateDeviceFunc create_func =
        reinterpret_cast<D3D11CreateDeviceFunc>(
            base::GetFunctionPointerFromNativeLibrary(d3d11_module,
                                                      "D3D11CreateDevice"));
    if (!create_func) {
      feature_level = FEATURE_LEVEL_NO_CREATE_DEVICE_ENTRY_POINT;
    } else {
      static const D3D_FEATURE_LEVEL d3d_feature_levels[] = {
        D3D_FEATURE_LEVEL_11_0,
        D3D_FEATURE_LEVEL_10_1,
        D3D_FEATURE_LEVEL_10_0,
        D3D_FEATURE_LEVEL_9_3,
        D3D_FEATURE_LEVEL_9_2,
        D3D_FEATURE_LEVEL_9_1
      };

      base::win::ScopedComPtr<ID3D11Device> device;
      D3D_FEATURE_LEVEL d3d_feature_level;
      base::win::ScopedComPtr<ID3D11DeviceContext> device_context;
      HRESULT hr = create_func(NULL,
                               D3D_DRIVER_TYPE_HARDWARE,
                               NULL,
                               0,
                               d3d_feature_levels,
                               arraysize(d3d_feature_levels),
                               D3D11_SDK_VERSION,
                               device.Receive(),
                               &d3d_feature_level,
                               device_context.Receive());
      if (FAILED(hr)) {
        feature_level = FEATURE_LEVEL_DEVICE_CREATION_FAILED;
      } else {
        switch (d3d_feature_level) {
          case D3D_FEATURE_LEVEL_11_0:
            feature_level = FEATURE_LEVEL_11_0;
            break;
          case D3D_FEATURE_LEVEL_10_1:
            feature_level = FEATURE_LEVEL_10_1;
            break;
          case D3D_FEATURE_LEVEL_10_0:
            feature_level = FEATURE_LEVEL_10_0;
            break;
          case D3D_FEATURE_LEVEL_9_3:
            feature_level = FEATURE_LEVEL_9_3;
            break;
          case D3D_FEATURE_LEVEL_9_2:
            feature_level = FEATURE_LEVEL_9_2;
            break;
          case D3D_FEATURE_LEVEL_9_1:
            feature_level = FEATURE_LEVEL_9_1;
            break;
          default:
            NOTREACHED();
            break;
        }

        hr = device->CheckFormatSupport(DXGI_FORMAT_B8G8R8A8_UNORM,
                                        &bgra_support);
        DCHECK(SUCCEEDED(hr));
      }
    }
  }

  UMA_HISTOGRAM_ENUMERATION("GPU.D3D11_FeatureLevel",
                            feature_level,
                            NUM_FEATURE_LEVELS);

  // ANGLE requires at least feature level 10.0. Do not record any further
  // stats if ANGLE would not work anyway.
  if (feature_level < FEATURE_LEVEL_10_0)
    return;

  UMA_HISTOGRAM_BOOLEAN(
      "GPU.D3D11_B8G8R8A8_Texture2DSupport",
      (bgra_support & D3D11_FORMAT_SUPPORT_TEXTURE2D) != 0);
  UMA_HISTOGRAM_BOOLEAN(
      "GPU.D3D11_B8G8R8A8_RenderTargetSupport",
      (bgra_support & D3D11_FORMAT_SUPPORT_RENDER_TARGET) != 0);
}

// Collects information about the level of D3D11 support and records it in
// the UMA stats. Records no stats when D3D11 in not supported at all.
void CollectD3D11Support() {
  // D3D11 takes about 50ms to initialize so do this on a worker thread.
  base::WorkerPool::PostTask(
      FROM_HERE,
      base::Bind(CollectD3D11SupportOnWorkerThread),
      false);
}
}  // namespace anonymous

#if !defined(GOOGLE_CHROME_BUILD)
AMDVideoCardType GetAMDVideocardType() {
  return STANDALONE;
}
#else
// This function has a real implementation for official builds that can
// be found in src/third_party/amd.
AMDVideoCardType GetAMDVideocardType();
#endif

bool CollectDriverInfoD3D(const std::wstring& device_id,
                          GPUInfo* gpu_info) {
  TRACE_EVENT0("gpu", "CollectDriverInfoD3D");

  // create device info for the display device
  HDEVINFO device_info = SetupDiGetClassDevsW(
      NULL, device_id.c_str(), NULL,
      DIGCF_PRESENT | DIGCF_PROFILE | DIGCF_ALLCLASSES);
  if (device_info == INVALID_HANDLE_VALUE) {
    LOG(ERROR) << "Creating device info failed";
    return false;
  }

  DWORD index = 0;
  bool found = false;
  SP_DEVINFO_DATA device_info_data;
  device_info_data.cbSize = sizeof(device_info_data);
  while (SetupDiEnumDeviceInfo(device_info, index++, &device_info_data)) {
    WCHAR value[255];
    if (SetupDiGetDeviceRegistryPropertyW(device_info,
                                        &device_info_data,
                                        SPDRP_DRIVER,
                                        NULL,
                                        reinterpret_cast<PBYTE>(value),
                                        sizeof(value),
                                        NULL)) {
      HKEY key;
      std::wstring driver_key = L"System\\CurrentControlSet\\Control\\Class\\";
      driver_key += value;
      LONG result = RegOpenKeyExW(
          HKEY_LOCAL_MACHINE, driver_key.c_str(), 0, KEY_QUERY_VALUE, &key);
      if (result == ERROR_SUCCESS) {
        DWORD dwcb_data = sizeof(value);
        std::string driver_version;
        result = RegQueryValueExW(
            key, L"DriverVersion", NULL, NULL,
            reinterpret_cast<LPBYTE>(value), &dwcb_data);
        if (result == ERROR_SUCCESS)
          driver_version = base::UTF16ToASCII(std::wstring(value));

        std::string driver_date;
        dwcb_data = sizeof(value);
        result = RegQueryValueExW(
            key, L"DriverDate", NULL, NULL,
            reinterpret_cast<LPBYTE>(value), &dwcb_data);
        if (result == ERROR_SUCCESS)
          driver_date = base::UTF16ToASCII(std::wstring(value));

        std::string driver_vendor;
        dwcb_data = sizeof(value);
        result = RegQueryValueExW(
            key, L"ProviderName", NULL, NULL,
            reinterpret_cast<LPBYTE>(value), &dwcb_data);
        if (result == ERROR_SUCCESS) {
          driver_vendor = base::UTF16ToASCII(std::wstring(value));
          if (driver_vendor == "Advanced Micro Devices, Inc." ||
              driver_vendor == "ATI Technologies Inc.") {
            // We are conservative and assume that in the absence of a clear
            // signal the videocard is assumed to be switchable. Additionally,
            // some switchable systems with Intel GPUs aren't correctly
            // detected, so always count them.
            AMDVideoCardType amd_card_type = GetAMDVideocardType();
            gpu_info->amd_switchable = (gpu_info->gpu.vendor_id == 0x8086) ||
                                       (amd_card_type != STANDALONE);
          }
        }

        gpu_info->driver_vendor = driver_vendor;
        gpu_info->driver_version = driver_version;
        gpu_info->driver_date = driver_date;
        found = true;
        RegCloseKey(key);
        break;
      }
    }
  }
  SetupDiDestroyDeviceInfoList(device_info);
  return found;
}

CollectInfoResult CollectContextGraphicsInfo(GPUInfo* gpu_info) {
  TRACE_EVENT0("gpu", "CollectGraphicsInfo");

  DCHECK(gpu_info);

  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseGL)) {
    std::string requested_implementation_name =
        CommandLine::ForCurrentProcess()->GetSwitchValueASCII(switches::kUseGL);
    if (requested_implementation_name == "swiftshader") {
      gpu_info->software_rendering = true;
      return kCollectInfoNonFatalFailure;
    }
  }

  CollectInfoResult result = CollectGraphicsInfoGL(gpu_info);
  if (result != kCollectInfoSuccess)
    return result;

  // ANGLE's renderer strings are of the form:
  // ANGLE (<adapter_identifier> Direct3D<version> vs_x_x ps_x_x)
  std::string direct3d_version;
  int vertex_shader_major_version = 0;
  int vertex_shader_minor_version = 0;
  int pixel_shader_major_version = 0;
  int pixel_shader_minor_version = 0;
  gpu_info->adapter_luid = 0;
  if (RE2::FullMatch(gpu_info->gl_renderer,
                     "ANGLE \\(.*\\)") &&
      RE2::PartialMatch(gpu_info->gl_renderer,
                        " Direct3D(\\w+)",
                        &direct3d_version) &&
      RE2::PartialMatch(gpu_info->gl_renderer,
                        " vs_(\\d+)_(\\d+)",
                        &vertex_shader_major_version,
                        &vertex_shader_minor_version) &&
      RE2::PartialMatch(gpu_info->gl_renderer,
                        " ps_(\\d+)_(\\d+)",
                        &pixel_shader_major_version,
                        &pixel_shader_minor_version)) {
    gpu_info->can_lose_context = direct3d_version == "9";
    gpu_info->vertex_shader_version =
        base::StringPrintf("%d.%d",
                           vertex_shader_major_version,
                           vertex_shader_minor_version);
    gpu_info->pixel_shader_version =
        base::StringPrintf("%d.%d",
                           pixel_shader_major_version,
                           pixel_shader_minor_version);

    // ANGLE's EGL vendor strings are of the form:
    // Google, Inc. (adapter LUID: 0123456789ABCDEF)
    // The LUID is optional and identifies the GPU adapter ANGLE is using.
    const char* egl_vendor = eglQueryString(
        gfx::GLSurfaceEGL::GetHardwareDisplay(),
        EGL_VENDOR);
    RE2::PartialMatch(egl_vendor,
                      " \\(adapter LUID: ([0-9A-Fa-f]{16})\\)",
                      RE2::Hex(&gpu_info->adapter_luid));

    // DirectX diagnostics are collected asynchronously because it takes a
    // couple of seconds. Do not mark gpu_info as complete until that is done.
    gpu_info->finalized = false;
  } else {
    gpu_info->finalized = true;
  }

  return kCollectInfoSuccess;
}

GpuIDResult CollectGpuID(uint32* vendor_id, uint32* device_id) {
  DCHECK(vendor_id && device_id);
  *vendor_id = 0;
  *device_id = 0;

  // Taken from http://developer.nvidia.com/object/device_ids.html
  DISPLAY_DEVICE dd;
  dd.cb = sizeof(DISPLAY_DEVICE);
  std::wstring id;
  for (int i = 0; EnumDisplayDevices(NULL, i, &dd, 0); ++i) {
    if (dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
      id = dd.DeviceID;
      break;
    }
  }

  if (id.length() > 20) {
    int vendor = 0, device = 0;
    std::wstring vendor_string = id.substr(8, 4);
    std::wstring device_string = id.substr(17, 4);
    base::HexStringToInt(base::UTF16ToASCII(vendor_string), &vendor);
    base::HexStringToInt(base::UTF16ToASCII(device_string), &device);
    *vendor_id = vendor;
    *device_id = device;
    return kGpuIDSuccess;
  }
  return kGpuIDFailure;
}

CollectInfoResult CollectBasicGraphicsInfo(GPUInfo* gpu_info) {
  TRACE_EVENT0("gpu", "CollectPreliminaryGraphicsInfo");

  DCHECK(gpu_info);

  gpu_info->performance_stats = RetrieveGpuPerformanceStatsWithHistograms();

  // nvd3d9wrap.dll is loaded into all processes when Optimus is enabled.
  HMODULE nvd3d9wrap = GetModuleHandleW(L"nvd3d9wrap.dll");
  gpu_info->optimus = nvd3d9wrap != NULL;

  gpu_info->lenovo_dcute = IsLenovoDCuteInstalled();

  gpu_info->display_link_version = DisplayLinkVersion();

  if (!gpu_info->display_link_version .IsValid()) {
    UMA_HISTOGRAM_ENUMERATION("GPU.DisplayLinkInstallationStatus",
                              DISPLAY_LINK_NOT_INSTALLED,
                              DISPLAY_LINK_INSTALLATION_STATUS_MAX);
  } else if (gpu_info->display_link_version.IsOlderThan("7.2")) {
    UMA_HISTOGRAM_ENUMERATION("GPU.DisplayLinkInstallationStatus",
                              DISPLAY_LINK_7_1_OR_EARLIER,
                              DISPLAY_LINK_INSTALLATION_STATUS_MAX);
  } else {
    UMA_HISTOGRAM_ENUMERATION("GPU.DisplayLinkInstallationStatus",
                              DISPLAY_LINK_7_2_OR_LATER,
                              DISPLAY_LINK_INSTALLATION_STATUS_MAX);
  }

  // Taken from http://developer.nvidia.com/object/device_ids.html
  DISPLAY_DEVICE dd;
  dd.cb = sizeof(DISPLAY_DEVICE);
  std::wstring id;
  for (int i = 0; EnumDisplayDevices(NULL, i, &dd, 0); ++i) {
    if (dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) {
      id = dd.DeviceID;
      break;
    }
  }

  if (id.length() <= 20)
    return kCollectInfoNonFatalFailure;

  int vendor_id = 0, device_id = 0;
  base::string16 vendor_id_string = id.substr(8, 4);
  base::string16 device_id_string = id.substr(17, 4);
  base::HexStringToInt(base::UTF16ToASCII(vendor_id_string), &vendor_id);
  base::HexStringToInt(base::UTF16ToASCII(device_id_string), &device_id);
  gpu_info->gpu.vendor_id = vendor_id;
  gpu_info->gpu.device_id = device_id;
  // TODO(zmo): we only need to call CollectDriverInfoD3D() if we use ANGLE.
  if (!CollectDriverInfoD3D(id, gpu_info))
    return kCollectInfoNonFatalFailure;

  // Collect basic information about supported D3D11 features. Delay for 45
  // seconds so as not to regress performance tests.
  if (D3D11ShouldWork(*gpu_info)) {
    // This is on a field trial so we can turn it off easily if it blows up
    // again in stable channel.
    scoped_refptr<base::FieldTrial> trial(
        base::FieldTrialList::FactoryGetFieldTrial(
            "D3D11Experiment", 100, "Disabled", 2015, 7, 8,
            base::FieldTrial::SESSION_RANDOMIZED, NULL));
    const int enabled_group =
        trial->AppendGroup("Enabled", 0);

    if (trial->group() == enabled_group) {
      base::MessageLoop::current()->PostDelayedTask(
          FROM_HERE,
          base::Bind(&CollectD3D11Support),
          base::TimeDelta::FromSeconds(45));
    }
  }

  return kCollectInfoSuccess;
}

CollectInfoResult CollectDriverInfoGL(GPUInfo* gpu_info) {
  TRACE_EVENT0("gpu", "CollectDriverInfoGL");

  if (!gpu_info->driver_version.empty())
    return kCollectInfoSuccess;

  std::string gl_version_string = gpu_info->gl_version_string;

  bool parsed = RE2::PartialMatch(
      gl_version_string, "([\\d\\.]+)$", &gpu_info->driver_version);
  return parsed ? kCollectInfoSuccess : kCollectInfoNonFatalFailure;
}

void MergeGPUInfo(GPUInfo* basic_gpu_info,
                  const GPUInfo& context_gpu_info) {
  DCHECK(basic_gpu_info);

  if (context_gpu_info.software_rendering) {
    basic_gpu_info->software_rendering = true;
    return;
  }

  MergeGPUInfoGL(basic_gpu_info, context_gpu_info);

  basic_gpu_info->dx_diagnostics = context_gpu_info.dx_diagnostics;
}

}  // namespace gpu