Refactor GpuDataManagerImpl to make it thread-safe.

content/browser/gpu/gpu_data_manager_impl.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.h"
 
-#if defined(OS_MACOSX)
-#include <ApplicationServices/ApplicationServices.h>
-#endif  // OS_MACOSX
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/command_line.h"
-#include "base/debug/trace_event.h"
-#include "base/file_util.h"
-#include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
-#include "base/stringprintf.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_piece.h"
-#include "base/sys_info.h"
-#include "base/values.h"
-#include "base/version.h"
-#include "content/browser/gpu/gpu_process_host.h"
-#include "content/browser/gpu/gpu_util.h"
-#include "content/common/gpu/gpu_messages.h"
-#include "content/gpu/gpu_info_collector.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 "content/public/common/gpu_feature_type.h"
-#include "gpu/command_buffer/service/gpu_switches.h"
-#include "grit/content_resources.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/glue/webpreferences.h"
-#include "webkit/plugins/plugin_switches.h"
-
-#if defined(OS_WIN)
-#include "base/win/windows_version.h"
-#endif
+#include "content/browser/gpu/gpu_data_manager_impl_private.h"
 
 namespace content {
-namespace {
-
-// Strip out the non-digital info; if after that, we get an empty string,
-// return "0".
-std::string ProcessVersionString(const std::string& raw_string) {
-  const std::string valid_set = "0123456789.";
-  size_t start_pos = raw_string.find_first_of(valid_set);
-  if (start_pos == std::string::npos)
-    return "0";
-  size_t end_pos = raw_string.find_first_not_of(raw_string, start_pos);
-  std::string version_string = raw_string.substr(
-      start_pos, end_pos - start_pos);
-  if (version_string.empty())
-    return "0";
-  return version_string;
-}
-
-// 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 & kCGDisplayAddFlag) {
-    GpuDataManagerImpl* manager =
-        reinterpret_cast<GpuDataManagerImpl*>(gpu_data_manager);
-    DCHECK(manager);
-    manager->HandleGpuSwitch();
-  }
-}
-#endif  // OS_MACOSX
-
-// 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
 
 // static
 GpuDataManager* GpuDataManager::GetInstance() {
   return GpuDataManagerImpl::GetInstance();
 }
 
 // static
 GpuDataManagerImpl* GpuDataManagerImpl::GetInstance() {
   return Singleton<GpuDataManagerImpl>::get();
 }
 
 void GpuDataManagerImpl::InitializeForTesting(
-    const std::string& gpu_blacklist_json,
-    const GPUInfo& gpu_info) {
-  // This function is for testing only, so disable histograms.
-  update_histograms_ = false;
-
-  InitializeImpl(gpu_blacklist_json, std::string(), std::string(), gpu_info);
+    const std::string& gpu_blacklist_json, const GPUInfo& gpu_info) {
+  base::AutoLock auto_lock(lock_);
+  private_->InitializeForTesting(gpu_blacklist_json, gpu_info);
 }
 
 bool GpuDataManagerImpl::IsFeatureBlacklisted(int feature) const {
-  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_FEATURE_TYPE_ACCELERATED_2D_CANVAS)
-      return true;
-    return false;
-  }
-
-  return (blacklisted_features_.count(feature) == 1);
-}
-
-size_t GpuDataManagerImpl::GetBlacklistedFeatureCount() const {
-  if (use_swiftshader_)
-    return 1;
-  return blacklisted_features_.size();
-}
-
-void GpuDataManagerImpl::AddGpuSwitchCallback(
-    const GpuSwitchCallback& callback) {
-  gpu_switch_callbacks_.push_back(callback);
-}
-
-void GpuDataManagerImpl::RemoveGpuSwitchCallback(
-    const GpuSwitchCallback& callback) {
-  for (size_t i = 0; i < gpu_switch_callbacks_.size(); i++) {
-    if (gpu_switch_callbacks_[i].Equals(callback)) {
-      gpu_switch_callbacks_.erase(gpu_switch_callbacks_.begin() + i);
-      return;
-    }
-  }
+  base::AutoLock auto_lock(lock_);
+  return private_->IsFeatureBlacklisted(feature);
 }
 
 GPUInfo GpuDataManagerImpl::GetGPUInfo() const {
-  GPUInfo gpu_info;
-  {
-    base::AutoLock auto_lock(gpu_info_lock_);
-    gpu_info = gpu_info_;
-  }
-  return gpu_info;
+  base::AutoLock auto_lock(lock_);
+  return private_->GetGPUInfo();
 }
 
 void GpuDataManagerImpl::GetGpuProcessHandles(
     const GetGpuProcessHandlesCallback& callback) const {
-  GpuProcessHost::GetProcessHandles(callback);
+  base::AutoLock auto_lock(lock_);
+  private_->GetGpuProcessHandles(callback);
 }
 
 bool GpuDataManagerImpl::GpuAccessAllowed(std::string* reason) const {
-  if (use_swiftshader_)
-    return true;
-
-  if (!gpu_info_.gpu_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_;
-  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() == 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;
+  base::AutoLock auto_lock(lock_);
+  return private_->GpuAccessAllowed(reason);
 }
 
 void GpuDataManagerImpl::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());
+  base::AutoLock auto_lock(lock_);
+  private_->RequestCompleteGpuInfoIfNeeded();
 }
 
 bool GpuDataManagerImpl::IsCompleteGpuInfoAvailable() const {
-  return gpu_info_.finalized;
+  base::AutoLock auto_lock(lock_);
+  return private_->IsCompleteGpuInfoAvailable();
 }
 
 void GpuDataManagerImpl::RequestVideoMemoryUsageStatsUpdate() const {
-  GpuProcessHost::SendOnIO(
-      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
-      CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
-      new GpuMsg_GetVideoMemoryUsageStats());
+  base::AutoLock auto_lock(lock_);
+  private_->RequestVideoMemoryUsageStatsUpdate();
 }
 
 bool GpuDataManagerImpl::ShouldUseSwiftShader() const {
-  return use_swiftshader_;
-}
-
-void GpuDataManagerImpl::RegisterSwiftShaderPath(const base::FilePath& path) {
-  swiftshader_path_ = path;
-  EnableSwiftShaderIfNecessary();
-}
-
-void GpuDataManagerImpl::AddObserver(GpuDataManagerObserver* observer) {
-  observer_list_->AddObserver(observer);
-}
-
-void GpuDataManagerImpl::RemoveObserver(GpuDataManagerObserver* observer) {
-  observer_list_->RemoveObserver(observer);
+  base::AutoLock auto_lock(lock_);
+  return private_->ShouldUseSwiftShader();
+}
+
+void GpuDataManagerImpl::RegisterSwiftShaderPath(
+    const base::FilePath& path) {
+  base::AutoLock auto_lock(lock_);
+  private_->RegisterSwiftShaderPath(path);
+}
+
+void GpuDataManagerImpl::AddObserver(
+    GpuDataManagerObserver* observer) {
+  base::AutoLock auto_lock(lock_);
+  private_->AddObserver(observer);
+}
+
+void GpuDataManagerImpl::RemoveObserver(
+    GpuDataManagerObserver* observer) {
+  base::AutoLock auto_lock(lock_);
+  private_->RemoveObserver(observer);
 }
 
 void GpuDataManagerImpl::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);
-
-  base::AutoLock auto_lock(gpu_info_lock_);
-  blocked_domains_.erase(domain);
-  timestamps_of_gpu_resets_.clear();
+  base::AutoLock auto_lock(lock_);
+  private_->UnblockDomainFrom3DAPIs(url);
 }
 
 void GpuDataManagerImpl::DisableGpuWatchdog() {
-  GpuProcessHost::SendOnIO(
-      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
-      CAUSE_FOR_GPU_LAUNCH_NO_LAUNCH,
-      new GpuMsg_DisableWatchdog);
+  base::AutoLock auto_lock(lock_);
+  private_->DisableGpuWatchdog();
 }
 
 void GpuDataManagerImpl::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;
-
-  GPUInfo gpu_info;
-  {
-    base::AutoLock auto_lock(gpu_info_lock_);
-    // 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_info = gpu_info_;
-  }
-
-  gpu_info.gl_vendor = gl_vendor;
-  gpu_info.gl_renderer = gl_renderer;
-  gpu_info.gl_version_string = gl_version;
-
-  gpu_info_collector::CollectDriverInfoGL(&gpu_info);
-
-  UpdateGpuInfo(gpu_info);
-  UpdateGpuSwitchingManager(gpu_info);
-  UpdatePreliminaryBlacklistedFeatures();
+  base::AutoLock auto_lock(lock_);
+  private_->SetGLStrings(gl_vendor, gl_renderer, gl_version);
 }
 
 void GpuDataManagerImpl::GetGLStrings(std::string* gl_vendor,
                                       std::string* gl_renderer,
                                       std::string* gl_version) {
-  DCHECK(gl_vendor && gl_renderer && gl_version);
-
-  base::AutoLock auto_lock(gpu_info_lock_);
-  *gl_vendor = gpu_info_.gl_vendor;
-  *gl_renderer = gpu_info_.gl_renderer;
-  *gl_version = gpu_info_.gl_version_string;
-}
-
+  base::AutoLock auto_lock(lock_);
+  private_->GetGLStrings(gl_vendor, gl_renderer, gl_version);
+}
+
+void GpuDataManagerImpl::DisableHardwareAcceleration() {
+  base::AutoLock auto_lock(lock_);
+  private_->DisableHardwareAcceleration();
+}
 
 void GpuDataManagerImpl::Initialize() {
-  TRACE_EVENT0("startup", "GpuDataManagerImpl::Initialize");
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kSkipGpuDataLoading))
-    return;
-
-  GPUInfo gpu_info;
-  {
-    TRACE_EVENT0("startup",
-      "GpuDataManagerImpl::Initialize:CollectBasicGraphicsInfo");
-    gpu_info_collector::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_switching_list_string;
-  std::string gpu_driver_bug_list_string;
-  if (!command_line->HasSwitch(switches::kIgnoreGpuBlacklist)) {
-    const base::StringPiece gpu_blacklist_json =
-        GetContentClient()->GetDataResource(
-            IDR_GPU_BLACKLIST, ui::SCALE_FACTOR_NONE);
-    gpu_blacklist_string = gpu_blacklist_json.as_string();
-    const base::StringPiece gpu_switching_list_json =
-        GetContentClient()->GetDataResource(
-            IDR_GPU_SWITCHING_LIST, ui::SCALE_FACTOR_NONE);
-    gpu_switching_list_string = gpu_switching_list_json.as_string();
-  }
-  if (!command_line->HasSwitch(switches::kDisableGpuDriverBugWorkarounds)) {
-    const base::StringPiece gpu_driver_bug_list_json =
-        GetContentClient()->GetDataResource(
-            IDR_GPU_DRIVER_BUG_LIST, ui::SCALE_FACTOR_NONE);
-    gpu_driver_bug_list_string = gpu_driver_bug_list_json.as_string();
-  }
-  InitializeImpl(gpu_blacklist_string,
-                 gpu_switching_list_string,
-                 gpu_driver_bug_list_string,
-                 gpu_info);
-  // We pass down the list to GPU command buffer through commandline
-  // switches at GPU process launch. However, in situations where we don't
-  // have a GPU process, we append the browser process commandline.
-  if (command_line->HasSwitch(switches::kSingleProcess) ||
-      command_line->HasSwitch(switches::kInProcessGPU)) {
-    if (!gpu_driver_bugs_.empty()) {
-      command_line->AppendSwitchASCII(switches::kGpuDriverBugWorkarounds,
-                                      IntSetToString(gpu_driver_bugs_));
-    }
-  }
+  base::AutoLock auto_lock(lock_);
+  private_->Initialize();
 }
 
 void GpuDataManagerImpl::UpdateGpuInfo(const GPUInfo& gpu_info) {
-  // No further update of gpu_info if falling back to SwiftShader.
-  if (use_swiftshader_)
-    return;
-
-  GPUInfo my_gpu_info;
-  {
-    base::AutoLock auto_lock(gpu_info_lock_);
-    gpu_info_collector::MergeGPUInfo(&gpu_info_, gpu_info);
-    complete_gpu_info_already_requested_ =
-        complete_gpu_info_already_requested_ || gpu_info_.finalized;
-    my_gpu_info = gpu_info_;
-  }
-
-  GetContentClient()->SetGpuInfo(my_gpu_info);
-
-  if (gpu_blacklist_) {
-    std::set<int> features = gpu_blacklist_->MakeDecision(
-        GpuControlList::kOsAny, std::string(), my_gpu_info);
-    if (update_histograms_)
-      UpdateStats(gpu_blacklist_.get(), features);
-
-    UpdateBlacklistedFeatures(features);
-  }
-  if (gpu_switching_list_) {
-    std::set<int> option = gpu_switching_list_->MakeDecision(
-        GpuControlList::kOsAny, std::string(), my_gpu_info);
-    if (option.size() == 1) {
-      // Blacklist decision should not overwrite commandline switch from users.
-      CommandLine* command_line = CommandLine::ForCurrentProcess();
-      if (!command_line->HasSwitch(switches::kGpuSwitching))
-        gpu_switching_ = static_cast<GpuSwitchingOption>(*(option.begin()));
-    }
-  }
-  if (gpu_driver_bug_list_)
-    gpu_driver_bugs_ = gpu_driver_bug_list_->MakeDecision(
-        GpuControlList::kOsAny, std::string(), my_gpu_info);
-
-  // We have to update GpuFeatureType before notify all the observers.
-  NotifyGpuInfoUpdate();
+  base::AutoLock auto_lock(lock_);
+  private_->UpdateGpuInfo(gpu_info);
 }
 
 void GpuDataManagerImpl::UpdateVideoMemoryUsageStats(
     const GPUVideoMemoryUsageStats& video_memory_usage_stats) {
-  observer_list_->Notify(&GpuDataManagerObserver::OnVideoMemoryUsageStatsUpdate,
-                         video_memory_usage_stats);
+  base::AutoLock auto_lock(lock_);
+  private_->UpdateVideoMemoryUsageStats(video_memory_usage_stats);
 }
 
 void GpuDataManagerImpl::AppendRendererCommandLine(
     CommandLine* command_line) const {
-  DCHECK(command_line);
-
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_WEBGL)) {
-#if !defined(OS_ANDROID)
-    if (!command_line->HasSwitch(switches::kDisableExperimentalWebGL))
-      command_line->AppendSwitch(switches::kDisableExperimentalWebGL);
-#endif
-    if (!command_line->HasSwitch(switches::kDisablePepper3d))
-      command_line->AppendSwitch(switches::kDisablePepper3d);
-  }
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_MULTISAMPLING) &&
-      !command_line->HasSwitch(switches::kDisableGLMultisampling))
-    command_line->AppendSwitch(switches::kDisableGLMultisampling);
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) &&
-      !command_line->HasSwitch(switches::kDisableAcceleratedCompositing))
-    command_line->AppendSwitch(switches::kDisableAcceleratedCompositing);
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS) &&
-      !command_line->HasSwitch(switches::kDisableAccelerated2dCanvas))
-    command_line->AppendSwitch(switches::kDisableAccelerated2dCanvas);
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE) &&
-      !command_line->HasSwitch(switches::kDisableAcceleratedVideoDecode))
-    command_line->AppendSwitch(switches::kDisableAcceleratedVideoDecode);
-  if (ShouldUseSwiftShader())
-    command_line->AppendSwitch(switches::kDisableFlashFullscreen3d);
+  base::AutoLock auto_lock(lock_);
+  private_->AppendRendererCommandLine(command_line);
 }
 
 void GpuDataManagerImpl::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 (IsFeatureBlacklisted(GPU_FEATURE_TYPE_MULTISAMPLING) &&
-      !command_line->HasSwitch(switches::kDisableGLMultisampling))
-    command_line->AppendSwitch(switches::kDisableGLMultisampling);
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_TEXTURE_SHARING))
-    command_line->AppendSwitch(switches::kDisableImageTransportSurface);
-
-  if (use_swiftshader_) {
-    command_line->AppendSwitchASCII(switches::kUseGL, "swiftshader");
-    if (swiftshader_path.empty())
-      swiftshader_path = swiftshader_path_;
-  } else if ((IsFeatureBlacklisted(GPU_FEATURE_TYPE_WEBGL) ||
-              IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) ||
-              IsFeatureBlacklisted(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");
-    switch (gpu_switching_) {
-      case GPU_SWITCHING_OPTION_FORCE_DISCRETE:
-        command_line->AppendSwitchASCII(switches::kGpuSwitching,
-            switches::kGpuSwitchingOptionNameForceDiscrete);
-        break;
-      case GPU_SWITCHING_OPTION_FORCE_INTEGRATED:
-        command_line->AppendSwitchASCII(switches::kGpuSwitching,
-            switches::kGpuSwitchingOptionNameForceIntegrated);
-        break;
-      case GPU_SWITCHING_OPTION_AUTOMATIC:
-      case GPU_SWITCHING_OPTION_UNKNOWN:
-        break;
-    }
-  } 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 defined(OS_WIN)
-  // DisplayLink 7.1 and earlier can cause the GPU process to crash on startup.
-  // http://crbug.com/177611
-  // Thinkpad USB Port Replicator driver causes GPU process to crash when the
-  // sandbox is enabled. http://crbug.com/181665.
-  if ((gpu_info_.display_link_version.IsValid()
-      && gpu_info_.display_link_version.IsOlderThan("7.2")) ||
-      gpu_info_.lenovo_dcute) {
-    command_line->AppendSwitch(switches::kReduceGpuSandbox);
-  }
-#endif
-
-  {
-    base::AutoLock auto_lock(gpu_info_lock_);
-    if (gpu_info_.optimus)
-      command_line->AppendSwitch(switches::kReduceGpuSandbox);
-    if (gpu_info_.amd_switchable) {
-      // The image transport surface currently doesn't work with AMD Dynamic
-      // Switchable graphics.
-      command_line->AppendSwitch(switches::kReduceGpuSandbox);
-      command_line->AppendSwitch(switches::kDisableImageTransportSurface);
-    }
-    // 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);
-  }
+  base::AutoLock auto_lock(lock_);
+  private_->AppendGpuCommandLine(command_line);
 }
 
 void GpuDataManagerImpl::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_FEATURE_TYPE_ACCELERATED_COMPOSITING) ||
-      CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableAcceleratedCompositing)) {
-    if (!command_line->HasSwitch(
-           switches::kDisableCoreAnimationPlugins))
-      command_line->AppendSwitch(
-          switches::kDisableCoreAnimationPlugins);
-  }
-#endif
-}
-
-void GpuDataManagerImpl::UpdateRendererWebPrefs(WebPreferences* prefs) const {
-  DCHECK(prefs);
-
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING))
-    prefs->accelerated_compositing_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_WEBGL))
-    prefs->experimental_webgl_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_FLASH3D))
-    prefs->flash_3d_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_FLASH_STAGE3D)) {
-    prefs->flash_stage3d_enabled = false;
-    prefs->flash_stage3d_baseline_enabled = false;
-  }
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_FLASH_STAGE3D_BASELINE))
-    prefs->flash_stage3d_baseline_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS))
-    prefs->accelerated_2d_canvas_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_MULTISAMPLING))
-    prefs->gl_multisampling_enabled = false;
-  if (IsFeatureBlacklisted(GPU_FEATURE_TYPE_3D_CSS)) {
-    prefs->accelerated_compositing_for_3d_transforms_enabled = false;
-    prefs->accelerated_compositing_for_animation_enabled = false;
-  }
-  if (IsFeatureBlacklisted(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 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;
-  }
+  base::AutoLock auto_lock(lock_);
+  private_->AppendPluginCommandLine(command_line);
+}
+
+void GpuDataManagerImpl::UpdateRendererWebPrefs(
+    WebPreferences* prefs) const {
+  base::AutoLock auto_lock(lock_);
+  private_->UpdateRendererWebPrefs(prefs);
 }
 
 GpuSwitchingOption GpuDataManagerImpl::GetGpuSwitchingOption() const {
-  if (!ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus())
-    return GPU_SWITCHING_OPTION_UNKNOWN;
-  return gpu_switching_;
-}
-
-void GpuDataManagerImpl::DisableHardwareAcceleration() {
-  card_blacklisted_ = true;
-
-  for (int i = 0; i < NUMBER_OF_GPU_FEATURE_TYPES; ++i)
-    blacklisted_features_.insert(i);
-
-  EnableSwiftShaderIfNecessary();
-  NotifyGpuInfoUpdate();
+  base::AutoLock auto_lock(lock_);
+  return private_->GetGpuSwitchingOption();
 }
 
 std::string GpuDataManagerImpl::GetBlacklistVersion() const {
-  if (gpu_blacklist_)
-    return gpu_blacklist_->version();
-  return "0";
+  base::AutoLock auto_lock(lock_);
+  return private_->GetBlacklistVersion();
 }
 
 base::ListValue* GpuDataManagerImpl::GetBlacklistReasons() const {
-  ListValue* reasons = new ListValue();
-  if (gpu_blacklist_)
-    gpu_blacklist_->GetReasons(reasons);
-  return reasons;
-}
-
-void GpuDataManagerImpl::AddLogMessage(
-    int level, const std::string& header, const std::string& message) {
-  base::AutoLock auto_lock(log_messages_lock_);
-  DictionaryValue* dict = new DictionaryValue();
-  dict->SetInteger("level", level);
-  dict->SetString("header", header);
-  dict->SetString("message", message);
-  log_messages_.Append(dict);
-}
-
-void GpuDataManagerImpl::ProcessCrashed(base::TerminationStatus exit_code) {
-  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
-    BrowserThread::PostTask(BrowserThread::UI,
-                            FROM_HERE,
-                            base::Bind(&GpuDataManagerImpl::ProcessCrashed,
-                                       base::Unretained(this),
-                                       exit_code));
-    return;
-  }
-  observer_list_->Notify(&GpuDataManagerObserver::OnGpuProcessCrashed,
-                         exit_code);
+  base::AutoLock auto_lock(lock_);
+  return private_->GetBlacklistReasons();
+}
+
+void GpuDataManagerImpl::AddLogMessage(int level,
+                                       const std::string& header,
+                                       const std::string& message) {
+  base::AutoLock auto_lock(lock_);
+  private_->AddLogMessage(level, header, message);
+}
+
+void GpuDataManagerImpl::ProcessCrashed(
+    base::TerminationStatus exit_code) {
+  base::AutoLock auto_lock(lock_);
+  private_->ProcessCrashed(exit_code);
 }
 
 base::ListValue* GpuDataManagerImpl::GetLogMessages() const {
-  base::ListValue* value;
-  {
-    base::AutoLock auto_lock(log_messages_lock_);
-    value = log_messages_.DeepCopy();
-  }
-  return value;
+  base::AutoLock auto_lock(lock_);
+  return private_->GetLogMessages();
 }
 
 void GpuDataManagerImpl::HandleGpuSwitch() {
-  complete_gpu_info_already_requested_ = false;
-  gpu_info_.finalized = false;
-  for (size_t i = 0; i < gpu_switch_callbacks_.size(); ++i)
-    gpu_switch_callbacks_[i].Run();
+  base::AutoLock auto_lock(lock_);
+  private_->HandleGpuSwitch();
 }
 
 #if defined(OS_WIN)
 bool GpuDataManagerImpl::IsUsingAcceleratedSurface() const {
-  if (base::win::GetVersion() < base::win::VERSION_VISTA)
-    return false;
-
-  if (gpu_info_.amd_switchable)
-    return false;
-  if (use_swiftshader_)
-    return false;
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kDisableImageTransportSurface))
-    return false;
-  return !IsFeatureBlacklisted(GPU_FEATURE_TYPE_TEXTURE_SHARING);
+  base::AutoLock auto_lock(lock_);
+  return private_->IsUsingAcceleratedSurface();
 }
 #endif
 
 void GpuDataManagerImpl::BlockDomainFrom3DAPIs(
     const GURL& url, DomainGuilt guilt) {
-  BlockDomainFrom3DAPIsAtTime(url, guilt, base::Time::Now());
+  base::AutoLock auto_lock(lock_);
+  private_->BlockDomainFrom3DAPIs(url, guilt);
 }
 
 bool GpuDataManagerImpl::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) {
-    BrowserThread::PostTask(
-        BrowserThread::UI, FROM_HERE,
-        base::Bind(&GpuDataManagerImpl::Notify3DAPIBlocked,
-                   base::Unretained(this), url, render_process_id,
-                   render_view_id, requester));
-  }
-
-  return blocked;
+  base::AutoLock auto_lock(lock_);
+  return private_->Are3DAPIsBlocked(
+      url, render_process_id, render_view_id, requester);
 }
 
 void GpuDataManagerImpl::DisableDomainBlockingFor3DAPIsForTesting() {
-  domain_blocking_enabled_ = false;
-}
-
-GpuDataManagerImpl::GpuDataManagerImpl()
-    : complete_gpu_info_already_requested_(false),
-      gpu_switching_(GPU_SWITCHING_OPTION_AUTOMATIC),
-      observer_list_(new GpuDataManagerObserverList),
-      use_swiftshader_(false),
-      card_blacklisted_(false),
-      update_histograms_(true),
-      window_count_(0),
-      domain_blocking_enabled_(true) {
-  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::kGpuSwitching)) {
-    std::string option_string = command_line->GetSwitchValueASCII(
-        switches::kGpuSwitching);
-    GpuSwitchingOption option = StringToGpuSwitchingOption(option_string);
-    if (option != GPU_SWITCHING_OPTION_UNKNOWN)
-      gpu_switching_ = option;
-  }
-
-#if defined(OS_MACOSX)
-  CGDisplayRegisterReconfigurationCallback(DisplayReconfigCallback, this);
-#endif  // OS_MACOSX
-}
-
-GpuDataManagerImpl::~GpuDataManagerImpl() {
-#if defined(OS_MACOSX)
-  CGDisplayRemoveReconfigurationCallback(DisplayReconfigCallback, this);
-#endif
-}
-
-void GpuDataManagerImpl::InitializeImpl(
-    const std::string& gpu_blacklist_json,
-    const std::string& gpu_switching_list_json,
-    const std::string& gpu_driver_bug_list_json,
-    const GPUInfo& gpu_info) {
-  std::string browser_version_string = ProcessVersionString(
-      GetContentClient()->GetProduct());
-  CHECK(!browser_version_string.empty());
-
-  if (!gpu_blacklist_json.empty()) {
-    gpu_blacklist_.reset(GpuBlacklist::Create());
-    gpu_blacklist_->LoadList(
-        browser_version_string, gpu_blacklist_json,
-        GpuControlList::kCurrentOsOnly);
-  }
-  if (!gpu_switching_list_json.empty()) {
-    gpu_switching_list_.reset(GpuSwitchingList::Create());
-    gpu_switching_list_->LoadList(
-        browser_version_string, gpu_switching_list_json,
-        GpuControlList::kCurrentOsOnly);
-  }
-  if (!gpu_driver_bug_list_json.empty()) {
-    gpu_driver_bug_list_.reset(GpuDriverBugList::Create());
-    gpu_driver_bug_list_->LoadList(
-        browser_version_string, gpu_driver_bug_list_json,
-        GpuControlList::kCurrentOsOnly);
-  }
-
-  {
-    base::AutoLock auto_lock(gpu_info_lock_);
-    gpu_info_ = gpu_info;
-  }
-  UpdateGpuInfo(gpu_info);
-  UpdateGpuSwitchingManager(gpu_info);
-  UpdatePreliminaryBlacklistedFeatures();
-}
-
-void GpuDataManagerImpl::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_FEATURE_TYPE_ACCELERATED_COMPOSITING);
-  }
-  if (card_blacklisted_ ||
-      command_line->HasSwitch(switches::kBlacklistWebGL)) {
-    blacklisted_features_.insert(GPU_FEATURE_TYPE_WEBGL);
-  }
-
-  EnableSwiftShaderIfNecessary();
-}
-
-void GpuDataManagerImpl::UpdatePreliminaryBlacklistedFeatures() {
-  preliminary_blacklisted_features_ = blacklisted_features_;
-}
-
-void GpuDataManagerImpl::UpdateGpuSwitchingManager(const GPUInfo& gpu_info) {
-  ui::GpuSwitchingManager::GetInstance()->SetGpuCount(
-      gpu_info.secondary_gpus.size() + 1);
-
-  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
-    switch (gpu_switching_) {
-      case GPU_SWITCHING_OPTION_FORCE_DISCRETE:
-        ui::GpuSwitchingManager::GetInstance()->ForceUseOfDiscreteGpu();
-        break;
-      case GPU_SWITCHING_OPTION_FORCE_INTEGRATED:
-        ui::GpuSwitchingManager::GetInstance()->ForceUseOfIntegratedGpu();
-        break;
-      case GPU_SWITCHING_OPTION_AUTOMATIC:
-      case GPU_SWITCHING_OPTION_UNKNOWN:
-        break;
-    }
-  }
-}
-
-void GpuDataManagerImpl::NotifyGpuInfoUpdate() {
-  observer_list_->Notify(&GpuDataManagerObserver::OnGpuInfoUpdate);
-}
-
-void GpuDataManagerImpl::EnableSwiftShaderIfNecessary() {
-  if (!GpuAccessAllowed(NULL) ||
-      blacklisted_features_.count(GPU_FEATURE_TYPE_WEBGL)) {
-    if (!swiftshader_path_.empty() &&
-        !CommandLine::ForCurrentProcess()->HasSwitch(
-             switches::kDisableSoftwareRasterizer))
-      use_swiftshader_ = true;
-  }
-}
-
-std::string GpuDataManagerImpl::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 GpuDataManagerImpl::BlockDomainFrom3DAPIsAtTime(
-    const GURL& url, DomainGuilt guilt, base::Time at_time) {
-  if (!domain_blocking_enabled_)
-    return;
-
-  std::string domain = GetDomainFromURL(url);
-
-  base::AutoLock auto_lock(gpu_info_lock_);
-  DomainBlockEntry& entry = blocked_domains_[domain];
-  entry.last_guilt = guilt;
-  timestamps_of_gpu_resets_.push_back(at_time);
-}
-
-GpuDataManagerImpl::DomainBlockStatus
-GpuDataManagerImpl::Are3DAPIsBlockedAtTime(
-    const GURL& url, base::Time at_time) const {
-  if (!domain_blocking_enabled_)
-    return 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);
-
-  base::AutoLock auto_lock(gpu_info_lock_);
-  {
-    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 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 DOMAIN_BLOCK_STATUS_ALL_DOMAINS_BLOCKED;
-  }
-
-  UMA_HISTOGRAM_ENUMERATION("GPU.BlockStatusForClient3DAPIs",
-                            BLOCK_STATUS_NOT_BLOCKED,
-                            BLOCK_STATUS_MAX);
-
-  return DOMAIN_BLOCK_STATUS_NOT_BLOCKED;
-}
-
-int64 GpuDataManagerImpl::GetBlockAllDomainsDurationInMs() const {
-  return kBlockAllDomainsMs;
+  base::AutoLock auto_lock(lock_);
+  private_->DisableDomainBlockingFor3DAPIsForTesting();
+}
+
+size_t GpuDataManagerImpl::GetBlacklistedFeatureCount() const {
+  base::AutoLock auto_lock(lock_);
+  return private_->GetBlacklistedFeatureCount();
 }
 
 void GpuDataManagerImpl::Notify3DAPIBlocked(const GURL& url,
                                             int render_process_id,
                                             int render_view_id,
                                             ThreeDAPIType requester) {
-  observer_list_->Notify(&GpuDataManagerObserver::DidBlock3DAPIs,
-                         url, render_process_id, render_view_id, requester);
+  base::AutoLock auto_lock(lock_);
+  private_->Notify3DAPIBlocked(
+      url, render_process_id, render_view_id, requester);
+}
+
+GpuDataManagerImpl::GpuDataManagerImpl()
+    : private_(GpuDataManagerImplPrivate::Create(this)) {
+}
+
+GpuDataManagerImpl::~GpuDataManagerImpl() {
 }
 
 }  // namespace content