Add a command-line flag to enable threaded GPU rasterization.

content/renderer/render_thread_impl.cc

 // 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/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 580 matching lines @@
   if (command_line.HasSwitch(switches::kGpuRasterizationMSAASampleCount)) {
     std::string string_value = command_line.GetSwitchValueASCII(
         switches::kGpuRasterizationMSAASampleCount);
     bool parsed_msaa_sample_count =
         base::StringToInt(string_value, &gpu_rasterization_msaa_sample_count_);
     DCHECK(parsed_msaa_sample_count) << string_value;
     DCHECK_GE(gpu_rasterization_msaa_sample_count_, 0);
   } else {
     gpu_rasterization_msaa_sample_count_ = 0;
   }
+  is_threaded_gpu_rasterization_enabled_ =
+      command_line.HasSwitch(switches::kEnableThreadedGpuRasterization);
 
   if (command_line.HasSwitch(switches::kDisableDistanceFieldText)) {
     is_distance_field_text_enabled_ = false;
   } else if (command_line.HasSwitch(switches::kEnableDistanceFieldText)) {
     is_distance_field_text_enabled_ = true;
   } else {
     is_distance_field_text_enabled_ = false;
   }
 
   // Note that under Linux, the media library will normally already have
@@ skipping 739 matching lines @@
 }
 
 bool RenderThreadImpl::IsGpuRasterizationForced() {
   return is_gpu_rasterization_forced_;
 }
 
 bool RenderThreadImpl::IsGpuRasterizationEnabled() {
   return is_gpu_rasterization_enabled_;
 }
 
+bool RenderThreadImpl::IsThreadedGpuRasterizationEnabled() {
+  return is_threaded_gpu_rasterization_enabled_;
+}
+
 int RenderThreadImpl::GetGpuRasterizationMSAASampleCount() {
   return gpu_rasterization_msaa_sample_count_;
 }
 
 bool RenderThreadImpl::IsLcdTextEnabled() {
   return is_lcd_text_enabled_;
 }
 
 bool RenderThreadImpl::IsDistanceFieldTextEnabled() {
   return is_distance_field_text_enabled_;
@@ skipping 12 matching lines @@
 }
 
 bool RenderThreadImpl::UseSingleThreadScheduler() {
   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
   return !cmd->HasSwitch(switches::kDisableSingleThreadProxyScheduler);
 }
 
 uint32 RenderThreadImpl::GetImageTextureTarget() {
   return use_image_texture_target_;
 }
+
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImpl::GetCompositorMainThreadTaskRunner() {
   return main_thread_compositor_task_runner_;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImpl::GetCompositorImplThreadTaskRunner() {
   return compositor_message_loop_proxy_;
 }
 
@@ skipping 407 matching lines @@
     mojo::InterfaceRequest<mojo::ServiceProvider> services,
     mojo::ServiceProviderPtr exposed_services)
     : services(services.Pass()),
       exposed_services(exposed_services.Pass()) {
 }
 
 RenderThreadImpl::PendingRenderFrameConnect::~PendingRenderFrameConnect() {
 }
 
 }  // namespace content