cc: Add 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 646 matching lines @@
   base::DiscardableMemory::SetPreferredType(type);
 
   if (is_impl_side_painting_enabled_) {
     int num_raster_threads = 0;
     std::string string_value =
         command_line.GetSwitchValueASCII(switches::kNumRasterThreads);
     bool parsed_num_raster_threads =
         base::StringToInt(string_value, &num_raster_threads);
     DCHECK(parsed_num_raster_threads) << string_value;
     DCHECK_GT(num_raster_threads, 0);
+
+    // Force maximum 1 thread for threaded GPU rasterization.
+    if (is_threaded_gpu_rasterization_enabled_)
+      num_raster_threads = 1;
     cc::TileTaskWorkerPool::SetNumWorkerThreads(num_raster_threads);
 
 #if defined(OS_ANDROID) || defined(OS_LINUX)
     if (!command_line.HasSwitch(
             switches::kUseNormalPriorityForTileTaskWorkerThreads)) {
       cc::TileTaskWorkerPool::SetWorkerThreadPriority(
           base::kThreadPriority_Background);
     }
 #endif
   }
@@ skipping 1145 matching lines @@
     mojo::InterfaceRequest<mojo::ServiceProvider> services,
     mojo::ServiceProviderPtr exposed_services)
     : services(services.Pass()),
       exposed_services(exposed_services.Pass()) {
 }
 
 RenderThreadImpl::PendingRenderFrameConnect::~PendingRenderFrameConnect() {
 }
 
 }  // namespace content