GPU: Adding sync points for cross-channel synchronization

content/common/gpu/client/command_buffer_proxy_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.
 
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
 
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/process_util.h"
@@ skipping 398 matching lines @@
   return Send(new GpuCommandBufferMsg_DiscardBackbuffer(route_id_));
 }
 
 bool CommandBufferProxyImpl::EnsureBackbuffer() {
   if (last_state_.error != gpu::error::kNoError)
     return false;
 
   return Send(new GpuCommandBufferMsg_EnsureBackbuffer(route_id_));
 }
 
+uint32 CommandBufferProxyImpl::InsertSyncPoint() {
+  uint32 sync_point = 0;
+  Send(new GpuCommandBufferMsg_InsertSyncPoint(route_id_, &sync_point));
+  return sync_point;
+}
+
+void CommandBufferProxyImpl::WaitSyncPoint(uint32 sync_point) {
+  Send(new GpuCommandBufferMsg_WaitSyncPoint(route_id_, sync_point));
+}
+
 bool CommandBufferProxyImpl::SetParent(
     CommandBufferProxy* parent_command_buffer,
     uint32 parent_texture_id) {
   if (last_state_.error != gpu::error::kNoError)
     return false;
 
   bool result;
   if (parent_command_buffer) {
     if (!Send(new GpuCommandBufferMsg_SetParent(
         route_id_,
@@ skipping 77 matching lines @@
 
 void CommandBufferProxyImpl::SetOnConsoleMessageCallback(
     const GpuConsoleMessageCallback& callback) {
   console_message_callback_ = callback;
 }
 
 void CommandBufferProxyImpl::TryUpdateState() {
   if (last_state_.error == gpu::error::kNoError)
     shared_state_->Read(&last_state_);
 }