Adding status to swap complete

ui/gl/gl_surface_stub.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 "ui/gl/gl_surface_stub.h"
 
 namespace gfx {
 
 void GLSurfaceStub::Destroy() {
 }
 
 bool GLSurfaceStub::IsOffscreen() {
   return false;
 }
 
-bool GLSurfaceStub::SwapBuffers() {
-  return true;
+gfx::SwapResult GLSurfaceStub::SwapBuffers() {
+  return gfx::SwapResult::SWAP_ACK;
 }
 
 gfx::Size GLSurfaceStub::GetSize() {
   return size_;
 }
 
 void* GLSurfaceStub::GetHandle() {
   return NULL;
 }
 
 GLSurfaceStub::~GLSurfaceStub() {}
 
 }  // namespace gfx