Call DidPostSwapBuffers and SwapBuffersComplete for browser software surface

content/browser/compositor/gpu_browser_compositor_output_surface.cc

Index: content/browser/compositor/gpu_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/gpu_browser_compositor_output_surface.cc b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
index efa805261e9d914d261aeaf5d7f46b7119ce8646..5f647626b27bae299a8a61158a096ed07579c17d 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
@@ -48,4 +48,18 @@ void GpuBrowserCompositorOutputSurface::SwapBuffers(
   OutputSurface::SwapBuffers(frame);
 }
 
+void GpuBrowserCompositorOutputSurface::OnSwapBuffersComplete() {
+  // On Mac, delay acknowledging the swap to the output surface client until
+  // it has been drawn.
+#if !defined(OS_MACOSX)
+  cc::OutputSurface::OnSwapBuffersComplete();
+#endif
+}
+
+#if defined(OS_MACOSX)
+void GpuBrowserCompositorOutputSurface::OnSurfaceDisplayed() {
+  cc::OutputSurface::OnSwapBuffersComplete();
+}
+#endif
+
 }  // namespace content