Turn off computation of the interest rect in cc in synchronized paint mode.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1186 matching lines @@
     command_line->AppendSwitch(switches::kEnablePartialRaster);
 
   if (IsForceGpuRasterizationEnabled())
     command_line->AppendSwitch(switches::kForceGpuRasterization);
 
   if (IsGpuMemoryBufferCompositorResourcesEnabled()) {
     command_line->AppendSwitch(
         switches::kEnableGpuMemoryBufferCompositorResources);
   }
 
+  if (IsBlinkSynchronizedPaintingEnabled()) {
+    command_line->AppendSwitch(
+      switches::kEnableBlinkSynchronizedPainting);
+  }
+
   // Persistent buffers may come at a performance hit (not all platform specific
   // buffers support it), so only enable them if partial raster is enabled and
   // we are actually going to use them.
   gfx::BufferUsage buffer_usage =
       IsPartialRasterEnabled()
           ? gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT
           : gfx::BufferUsage::GPU_READ_CPU_READ_WRITE;
   std::vector<unsigned> image_targets(
       static_cast<size_t>(gfx::BufferFormat::LAST) + 1, GL_TEXTURE_2D);
   for (size_t format = 0;
@@ skipping 1420 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content