cc: Partial tile update for one-copy raster.

content/browser/renderer_host/render_process_host_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.
 
 // 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 1123 matching lines @@
     command_line->AppendSwitch(switches::kForceGpuRasterization);
 
   // TODO(reveman): We currently assume that the compositor will use BGRA_8888
   // if it's able to, and RGBA_8888 otherwise. Since we don't know what it will
   // use we hardcode BGRA_8888 here for now. We should instead
   // move decisions about GpuMemoryBuffer format to the browser embedder so we
   // know it here, and pass that decision to the compositor for each usage.
   // crbug.com/490362
   gfx::GpuMemoryBuffer::Format format = gfx::GpuMemoryBuffer::BGRA_8888;
 
-  // TODO(danakj): When one-copy uploads support partial update, change this
-  // usage to PERSISTENT_MAP for one-copy.
   gfx::GpuMemoryBuffer::Usage usage = gfx::GpuMemoryBuffer::MAP;
+  if (HavePersistentGpuMemoryBuffers()) {
+    usage = gfx::GpuMemoryBuffer::PERSISTENT_MAP;
+    command_line->AppendSwitch(switches::kUsePersistentGpuMemoryBuffers);
+  }
 
   command_line->AppendSwitchASCII(
       switches::kUseImageTextureTarget,
       base::UintToString(
           BrowserGpuChannelHostFactory::GetImageTextureTarget(format, usage)));
 
   // Appending disable-gpu-feature switches due to software rendering list.
   GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
   DCHECK(gpu_data_manager);
   gpu_data_manager->AppendRendererCommandLine(command_line);
@@ skipping 1314 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content