Read compositor VSync information from platform, when possible

content/browser/compositor/gpu_browser_compositor_output_surface.cc

 // Copyright 2014 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/browser/compositor/gpu_browser_compositor_output_surface.h"
 
 #include "cc/output/compositor_frame.h"
 #include "content/browser/compositor/reflector_impl.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace content {
 
 GpuBrowserCompositorOutputSurface::GpuBrowserCompositorOutputSurface(
     const scoped_refptr<ContextProviderCommandBuffer>& context,
     int surface_id,
     IDMap<BrowserCompositorOutputSurface>* output_surface_map,
-    base::MessageLoopProxy* compositor_message_loop,
-    base::WeakPtr<ui::Compositor> compositor)
+    const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager)
     : BrowserCompositorOutputSurface(context,
                                      surface_id,
                                      output_surface_map,
-                                     compositor_message_loop,
-                                     compositor) {}
+                                     vsync_manager) {}
 
 GpuBrowserCompositorOutputSurface::~GpuBrowserCompositorOutputSurface() {}
 
 void GpuBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   DCHECK(frame->gl_frame_data);
 
   ContextProviderCommandBuffer* provider_command_buffer =
       static_cast<ContextProviderCommandBuffer*>(context_provider_.get());
   CommandBufferProxyImpl* command_buffer_proxy =
       provider_command_buffer->GetCommandBufferProxy();
   DCHECK(command_buffer_proxy);
   context_provider_->ContextGL()->ShallowFlushCHROMIUM();
   command_buffer_proxy->SetLatencyInfo(frame->metadata.latency_info);
 
   if (reflector_.get()) {
     if (frame->gl_frame_data->sub_buffer_rect ==
         gfx::Rect(frame->gl_frame_data->size))
       reflector_->OnSwapBuffers();
     else
       reflector_->OnPostSubBuffer(frame->gl_frame_data->sub_buffer_rect);
   }
 
   OutputSurface::SwapBuffers(frame);
 }
 
 }  // namespace content