Adding support for VSyncProvider to the software drawing path

content/browser/aura/software_browser_compositor_output_surface.cc

 // Copyright 2013 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/aura/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/aura/browser_compositor_output_surface_proxy.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "ui/events/latency_info.h"
+#include "ui/gl/vsync_provider.h"
 
 namespace content {
 
 SoftwareBrowserCompositorOutputSurface::SoftwareBrowserCompositorOutputSurface(
-    scoped_ptr<cc::SoftwareOutputDevice> software_device)
-    : cc::OutputSurface(software_device.Pass()) {}
+    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)
+    : BrowserCompositorOutputSurface(software_device.Pass(),
+                                     surface_id,
+                                     output_surface_map,
+                                     compositor_message_loop,
+                                     compositor),
+      output_surface_proxy_(surface_proxy) {}
+
+SoftwareBrowserCompositorOutputSurface::
+    ~SoftwareBrowserCompositorOutputSurface() {}
 
 void SoftwareBrowserCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   ui::LatencyInfo latency_info = frame->metadata.latency_info;
   latency_info.AddLatencyNumber(
       ui::INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 0, 0);
 
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(
           &RenderWidgetHostImpl::CompositorFrameDrawn,
           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