Add EncodeBackbufferCHROMIUM support to GLES2 command stream

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 1d366022bbbf05cdc616133fdaf42eacefb51552..4a77a18d53b3f4bec585a6033cce0df04ab60eb7 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -643,6 +643,9 @@ class GLES2DecoderImpl : public GLES2Decoder {
   virtual void SetWaitSyncPointCallback(
       const WaitSyncPointCallback& callback) OVERRIDE;
 
+  virtual void SetEncodeBackbufferCallback(
+      const EncodeBackbufferCallback& callback) OVERRIDE;
+
   virtual void SetStreamTextureManager(StreamTextureManager* manager) OVERRIDE;
 
   virtual gfx::AsyncPixelTransferDelegate*
@@ -1732,6 +1735,8 @@ class GLES2DecoderImpl : public GLES2Decoder {
 
   ShaderCacheCallback shader_cache_callback_;
 
+  EncodeBackbufferCallback encode_backbuffer_callback_;
+
   StreamTextureManager* stream_texture_manager_;
   scoped_ptr<gfx::AsyncPixelTransferDelegate> async_pixel_transfer_delegate_;
 
@@ -3120,6 +3125,11 @@ void GLES2DecoderImpl::SetWaitSyncPointCallback(
   wait_sync_point_callback_ = callback;
 }
 
+void GLES2DecoderImpl::SetEncodeBackbufferCallback(
+    const EncodeBackbufferCallback& callback) {
+  encode_backbuffer_callback_ = callback;
+}
+
 void GLES2DecoderImpl::SetStreamTextureManager(StreamTextureManager* manager) {
   stream_texture_manager_ = manager;
 }
@@ -9254,6 +9264,14 @@ error::Error GLES2DecoderImpl::HandleWaitSyncPointCHROMIUM(
       error::kNoError : error::kDeferCommandUntilLater;
 }
 
+error::Error GLES2DecoderImpl::HandleEncodeBackbufferCHROMIUM(
+    uint32 immediate_data_size, const cmds::EncodeBackbufferCHROMIUM& c) {
+  if (!encode_backbuffer_callback_.is_null())
+    encode_backbuffer_callback_.Run();
+
+  return error::kNoError;
+}
+
 bool GLES2DecoderImpl::GenQueriesEXTHelper(
     GLsizei n, const GLuint* client_ids) {
   for (GLsizei ii = 0; ii < n; ++ii) {