cc: Make most of cc::OutputSurface abstract.

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc

Index: content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc b/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
index a46fc17d5df9121b710be5876bb3cf0b54bf9b8f..6f759206916d72791bd01ca8292607ff5ca75d0d 100644
--- a/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc
@@ -75,12 +75,6 @@ void GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(
   GpuBrowserCompositorOutputSurface::SwapBuffers(std::move(frame));
 }
 
-void GpuSurfacelessBrowserCompositorOutputSurface::OnSwapBuffersComplete() {
-  DCHECK(buffer_queue_);
-  buffer_queue_->PageFlipComplete();
-  GpuBrowserCompositorOutputSurface::OnSwapBuffersComplete();
-}
-
 void GpuSurfacelessBrowserCompositorOutputSurface::BindFramebuffer() {
   DCHECK(buffer_queue_);
   buffer_queue_->BindFramebuffer();
@@ -114,6 +108,7 @@ void GpuSurfacelessBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
     buffer_queue_->RecreateBuffers();
     force_swap = true;
   }
+  buffer_queue_->PageFlipComplete();
   GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
       latency_info, result, params_mac);
   if (force_swap)