Add category handling to RasterWorkerPool

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index db1591c407bfda3a28758117657834259d1a42cc..602cbcb511a12fb769b03f775b6461d4c9fb04df 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -802,6 +802,9 @@ void RenderThreadImpl::Init() {
   // avoid it for now to reduce the cost of recording.
   are_image_decode_tasks_enabled_ = num_raster_threads > 1;
 
+  bool use_single_thread_for_background_raster_tasks = command_line.HasSwitch(
+      switches::kUseSingleThreadForBackgroundRasterTasks);
+
   base::SimpleThread::Options thread_options;
 #if defined(OS_ANDROID) || defined(OS_LINUX)
   if (!command_line.HasSwitch(
@@ -810,7 +813,9 @@ void RenderThreadImpl::Init() {
   }
 #endif
 
-  raster_worker_pool_->Start(num_raster_threads, thread_options);
+  raster_worker_pool_->Start(num_raster_threads,
+                             use_single_thread_for_background_raster_tasks,
+                             thread_options);
 
   // TODO(boliu): In single process, browser main loop should set up the
   // discardable memory manager, and should skip this if kSingleProcess.