[exp] cc: Introduce cc::CompositorMutator.

content/renderer/gpu/render_widget_compositor.cc

 // 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/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 430 matching lines @@
 
   scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner =
       compositor_deps_->GetCompositorImplThreadTaskRunner();
   scoped_refptr<base::SingleThreadTaskRunner>
       main_thread_compositor_task_runner =
           compositor_deps_->GetCompositorMainThreadTaskRunner();
   cc::SharedBitmapManager* shared_bitmap_manager =
       compositor_deps_->GetSharedBitmapManager();
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager =
       compositor_deps_->GetGpuMemoryBufferManager();
+  cc::CompositorMutator* compositor_mutator =
+      compositor_deps_->GetCompositorMutator();
 
   scoped_ptr<cc::BeginFrameSource> external_begin_frame_source;
   if (settings.use_external_begin_frame_source) {
     external_begin_frame_source =
         compositor_deps_->CreateExternalBeginFrameSource(widget_->routing_id());
   }
 
   if (compositor_thread_task_runner.get()) {
     layer_tree_host_ = cc::LayerTreeHost::CreateThreaded(
-        this, shared_bitmap_manager, gpu_memory_buffer_manager, settings,
-        main_thread_compositor_task_runner, compositor_thread_task_runner,
-        external_begin_frame_source.Pass());
+        this, shared_bitmap_manager, gpu_memory_buffer_manager,
+        compositor_mutator, settings, main_thread_compositor_task_runner,
+        compositor_thread_task_runner, external_begin_frame_source.Pass());
   } else {
     layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
-        this, this, shared_bitmap_manager, gpu_memory_buffer_manager, settings,
-        main_thread_compositor_task_runner, external_begin_frame_source.Pass());
+        this, this, shared_bitmap_manager, gpu_memory_buffer_manager,
+        compositor_mutator, settings, main_thread_compositor_task_runner,
+        external_begin_frame_source.Pass());
   }
   DCHECK(layer_tree_host_);
 }
 
 RenderWidgetCompositor::~RenderWidgetCompositor() {}
 
 const base::WeakPtr<cc::InputHandler>&
 RenderWidgetCompositor::GetInputHandler() {
   return layer_tree_host_->GetInputHandler();
 }
@@ skipping 435 matching lines @@
   cc::ContextProvider* provider =
       compositor_deps_->GetSharedMainThreadContextProvider();
   // provider can be NULL after the GPU process crashed enough times and we
   // don't want to restart it any more (falling back to software).
   if (!provider)
     return;
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content