Implement proper synchronization between HW video decode IPC and CommandBuffer.

webkit/plugins/ppapi/ppb_video_decoder_impl.cc

Index: webkit/plugins/ppapi/ppb_video_decoder_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_video_decoder_impl.cc b/webkit/plugins/ppapi/ppb_video_decoder_impl.cc
index 12d6ee18a404a73481147700fccf983ca249f4e9..19fa7765e65dc1a55c3ef005f0ec4b533d7cd11c 100644
--- a/webkit/plugins/ppapi/ppb_video_decoder_impl.cc
+++ b/webkit/plugins/ppapi/ppb_video_decoder_impl.cc
@@ -8,6 +8,7 @@
 
 #include "base/logging.h"
 #include "base/message_loop.h"
+#include "gpu/command_buffer/client/gles2_implementation.h"
 #include "media/video/picture.h"
 #include "ppapi/c/dev/pp_video_dev.h"
 #include "ppapi/c/dev/ppb_video_decoder_dev.h"
@@ -127,7 +128,7 @@ int32_t PPB_VideoDecoder_Impl::Initialize(
 
   platform_video_decoder_.reset(
       instance()->delegate()->CreateVideoDecoder(
-          this, command_buffer_route_id));
+          this, command_buffer_route_id, context3d->gles2_impl()->helper()));
 
   if (!platform_video_decoder_.get())
     return PP_ERROR_FAILED;
@@ -160,10 +161,8 @@ int32_t PPB_VideoDecoder_Impl::Decode(
   CHECK(bitstream_buffer_callbacks_.insert(std::make_pair(
       bitstream_buffer->id, callback)).second);
 
-  if (platform_video_decoder_->Decode(decode_buffer))
-    return PP_OK_COMPLETIONPENDING;
-  else
-    return PP_ERROR_FAILED;
+  platform_video_decoder_->Decode(decode_buffer);
+  return PP_OK_COMPLETIONPENDING;
 }
 
 void PPB_VideoDecoder_Impl::AssignGLESBuffers(
@@ -210,10 +209,8 @@ int32_t PPB_VideoDecoder_Impl::Flush(PP_CompletionCallback callback) {
   // TODO(vmr): Check for current flush/abort operations.
   flush_callback_ = callback;
 
-  if (platform_video_decoder_->Flush())
-    return PP_OK_COMPLETIONPENDING;
-  else
-    return PP_ERROR_FAILED;
+  platform_video_decoder_->Flush();
+  return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_VideoDecoder_Impl::Abort(PP_CompletionCallback callback) {
@@ -224,10 +221,8 @@ int32_t PPB_VideoDecoder_Impl::Abort(PP_CompletionCallback callback) {
   // TODO(vmr): Check for current flush/abort operations.
   abort_callback_ = callback;
 
-  if (platform_video_decoder_->Abort())
-    return PP_OK_COMPLETIONPENDING;
-  else
-    return PP_ERROR_FAILED;
+  platform_video_decoder_->Abort();
+  return PP_OK_COMPLETIONPENDING;
 }
 
 void PPB_VideoDecoder_Impl::ProvidePictureBuffers(