Implement proper synchronization between HW video decode IPC and CommandBuffer.

content/renderer/pepper_platform_video_decoder_impl.cc

Index: content/renderer/pepper_platform_video_decoder_impl.cc
diff --git a/content/renderer/pepper_platform_video_decoder_impl.cc b/content/renderer/pepper_platform_video_decoder_impl.cc
index 1217bb97e2fb42a8e45d67f8ae2aa15ed353cbb4..453729b5c8d9d84a4725f0eed5003bb286fbc99b 100644
--- a/content/renderer/pepper_platform_video_decoder_impl.cc
+++ b/content/renderer/pepper_platform_video_decoder_impl.cc
@@ -17,9 +17,12 @@
 using media::BitstreamBuffer;
 
 PlatformVideoDecoderImpl::PlatformVideoDecoderImpl(
-    VideoDecodeAccelerator::Client* client, uint32 command_buffer_route_id)
+    VideoDecodeAccelerator::Client* client,
+    int32 command_buffer_route_id,
+    gpu::CommandBufferHelper* cmd_buffer_helper)
     : client_(client),
       command_buffer_route_id_(command_buffer_route_id),
+      cmd_buffer_helper_(cmd_buffer_helper),
       decoder_(NULL),
       message_loop_(NULL) {
   DCHECK(client);
@@ -78,15 +81,15 @@ void PlatformVideoDecoderImpl::InitializeDecoder(
   }
   GpuVideoServiceHost* video_service = channel_->gpu_video_service_host();
   decoder_.reset(video_service->CreateVideoAccelerator(
-      this, command_buffer_route_id_));
+      this, command_buffer_route_id_, cmd_buffer_helper_));
 
   // Send IPC message to initialize decoder in GPU process.
   decoder_->Initialize(configs);
 }
 
-bool PlatformVideoDecoderImpl::Decode(const BitstreamBuffer& bitstream_buffer) {
+void PlatformVideoDecoderImpl::Decode(const BitstreamBuffer& bitstream_buffer) {
   DCHECK(decoder_.get());
-  return decoder_->Decode(bitstream_buffer);
+  decoder_->Decode(bitstream_buffer);
 }
 
 void PlatformVideoDecoderImpl::AssignGLESBuffers(
@@ -107,14 +110,14 @@ void PlatformVideoDecoderImpl::ReusePictureBuffer(
   decoder_->ReusePictureBuffer(picture_buffer_id);
 }
 
-bool PlatformVideoDecoderImpl::Flush() {
+void PlatformVideoDecoderImpl::Flush() {
   DCHECK(decoder_.get());
-  return decoder_->Flush();
+  decoder_->Flush();
 }
 
-bool PlatformVideoDecoderImpl::Abort() {
+void PlatformVideoDecoderImpl::Abort() {
   DCHECK(decoder_.get());
-  return decoder_->Abort();
+  decoder_->Abort();
 }
 
 void PlatformVideoDecoderImpl::NotifyEndOfStream() {