Allow Windows to use system Vsync if only one window is swapping

ui/gl/gl_surface.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.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 247 matching lines @@
     return false;
   std::string extensions(c_extensions);
   extensions += " ";
 
   std::string delimited_name(name);
   delimited_name += " ";
 
   return extensions.find(delimited_name) != std::string::npos;
 }
 
+void GLSurface::SetSwapInterval(int interval) {
+}
+
 GLSurfaceAdapter::GLSurfaceAdapter(GLSurface* surface) : surface_(surface) {}
 
 bool GLSurfaceAdapter::Initialize() {
   return surface_->Initialize();
 }
 
 void GLSurfaceAdapter::Destroy() {
   surface_->Destroy();
 }
 
@@ skipping 78 matching lines @@
       z_order, transform, image, bounds_rect, crop_rect);
 }
 
 bool GLSurfaceAdapter::IsSurfaceless() const {
   return surface_->IsSurfaceless();
 }
 
 GLSurfaceAdapter::~GLSurfaceAdapter() {}
 
 }  // namespace gfx