[Do not submit] D3DKMTWaitForVerticalBlankEvent VSync prototype

content/browser/compositor/gpu_browser_compositor_output_surface.h

Index: content/browser/compositor/gpu_browser_compositor_output_surface.h
diff --git a/content/browser/compositor/gpu_browser_compositor_output_surface.h b/content/browser/compositor/gpu_browser_compositor_output_surface.h
index 6bf62dbce91b5a28f09e27b32cecf07801845f6c..df5d28ca427fe0880c25d34a6be21c26c43b6116 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.h
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.h
@@ -11,6 +11,7 @@
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
+#include "content/browser/compositor/gpu_vsync_begin_frame_source.h"
 #include "ui/gfx/swap_result.h"
 
 namespace display_compositor {
@@ -33,8 +34,8 @@ class ReflectorTexture;
 // Adapts a WebGraphicsContext3DCommandBufferImpl into a
 // cc::OutputSurface that also handles vsync parameter updates
 // arriving from the GPU process.
-class GpuBrowserCompositorOutputSurface
-    : public BrowserCompositorOutputSurface {
+class GpuBrowserCompositorOutputSurface : public BrowserCompositorOutputSurface,
+                                          public GpuVSyncControl {
  public:
   GpuBrowserCompositorOutputSurface(
       scoped_refptr<ui::ContextProviderCommandBuffer> context,
@@ -75,6 +76,11 @@ class GpuBrowserCompositorOutputSurface
   unsigned GetOverlayTextureId() const override;
   bool SurfaceIsSuspendForRecycle() const override;
 
+  GpuVSyncControl* GetVSyncControl() override;
+
+  // GpuVSyncControl
+  void EnableVSync(bool enabled) override;
+
  protected:
   gpu::CommandBufferProxyImpl* GetCommandBufferProxy();