[Do not submit] D3DKMTWaitForVerticalBlankEvent VSync prototype

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 1d65415c2f4de51dc5aaa7dc9afce98a507f7568..aa20130465c48f3fa03ac5d8f4764585052fdd82 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
@@ -40,6 +40,22 @@ GpuBrowserCompositorOutputSurface::~GpuBrowserCompositorOutputSurface() {
       UpdateVSyncParametersCallback());
 }
 
+GpuVSyncControl* GpuBrowserCompositorOutputSurface::GetVSyncControl() {
+#if defined(OS_WIN)
+  return this;
+#else
+  return nullptr;
+#endif  // defined(OS_WIN)
+}
+
+void GpuBrowserCompositorOutputSurface::EnableVSync(bool enabled) {
+#if defined(OS_WIN)
+  GetCommandBufferProxy()->EnableVSync(enabled);
+#else
+  NOTREACHED();
+#endif  // defined(OS_WIN)
+}
+
 void GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
     const std::vector<ui::LatencyInfo>& latency_info,
     gfx::SwapResult result,