OnSwapBuffersComplete in GpuSurfacelessBrowserCompositorOutputSurface is never called.

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 "cc/output/output_surface_client.h"
 #include "content/browser/compositor/reflector_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
@@ skipping 76 matching lines @@
   NOTREACHED();
 #else
   if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
     RenderWidgetHostImpl::CompositorFrameDrawn(latency_info);
   } else {
     BrowserThread::PostTask(
         BrowserThread::UI,
         FROM_HERE,
         base::Bind(&RenderWidgetHostImpl::CompositorFrameDrawn, latency_info));
   }
-  cc::OutputSurface::OnSwapBuffersComplete();
+  OnSwapBuffersComplete();
 #endif
 }
 
 #if defined(OS_MACOSX)
 void GpuBrowserCompositorOutputSurface::OnSurfaceDisplayed() {
   cc::OutputSurface::OnSwapBuffersComplete();
 }
 #endif
 
 }  // namespace content