GPU: Adding sync points for cross-channel synchronization

ppapi/proxy/ppapi_command_buffer_proxy.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.
 
 #include "ppapi/proxy/ppapi_command_buffer_proxy.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/host_resource.h"
@@ skipping 42 matching lines @@
 bool PpapiCommandBufferProxy::DiscardBackbuffer() {
   NOTIMPLEMENTED();
   return true;
 }
 
 bool PpapiCommandBufferProxy::EnsureBackbuffer() {
   NOTIMPLEMENTED();
   return true;
 }
 
+uint32 PpapiCommandBufferProxy::InsertSyncPoint() {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
+void PpapiCommandBufferProxy::WaitSyncPoint(uint32 sync_point) {
+  NOTIMPLEMENTED();
+}
+
 void PpapiCommandBufferProxy::SetMemoryAllocationChangedCallback(
       const base::Callback<void(const GpuMemoryAllocationForRenderer&)>&
           callback) {
   NOTIMPLEMENTED();
 }
 
 bool PpapiCommandBufferProxy::SetParent(
     CommandBufferProxy* parent_command_buffer,
     uint32 parent_texture_id) {
   // TODO(fsamuel): Need a proper implementation of this to support offscreen
@@ skipping 197 matching lines @@
       last_state_ = state;
     }
   } else {
     last_state_.error = gpu::error::kLostContext;
     ++last_state_.generation;
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi
-