Read compositor VSync information from platform, when possible

content/browser/compositor/software_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/software_browser_compositor_output_surface.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/software_output_device.h"
 #include "content/browser/compositor/browser_compositor_output_surface_proxy.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "ui/events/latency_info.h"
 #include "ui/gfx/vsync_provider.h"
 
 namespace content {
 
 SoftwareBrowserCompositorOutputSurface::SoftwareBrowserCompositorOutputSurface(
     scoped_refptr<BrowserCompositorOutputSurfaceProxy> surface_proxy,
     scoped_ptr<cc::SoftwareOutputDevice> software_device,
     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(software_device.Pass(),
                                      surface_id,
                                      output_surface_map,
-                                     compositor_message_loop,
-                                     compositor),
+                                     vsync_manager),
       output_surface_proxy_(surface_proxy) {}
 
 SoftwareBrowserCompositorOutputSurface::
     ~SoftwareBrowserCompositorOutputSurface() {}
 
 void SoftwareBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   for (size_t i = 0; i < frame->metadata.latency_info.size(); i++) {
     frame->metadata.latency_info[i].AddLatencyNumber(
         ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0);
   }
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(
           &RenderWidgetHostImpl::CompositorFrameDrawn,
           frame->metadata.latency_info));
 
   gfx::VSyncProvider* vsync_provider = software_device()->GetVSyncProvider();
   if (vsync_provider) {
     vsync_provider->GetVSyncParameters(
         base::Bind(&BrowserCompositorOutputSurfaceProxy::
                         OnUpdateVSyncParametersOnCompositorThread,
                    output_surface_proxy_,
                    surface_id_));
   }
 }
 
 }  // namespace content