gpu: Initial implementation of CommitOverlayPlanes

gpu/command_buffer/client/context_support.h

Index: gpu/command_buffer/client/context_support.h
diff --git a/gpu/command_buffer/client/context_support.h b/gpu/command_buffer/client/context_support.h
index d6461e16f9ce2c9361b4d81ec8676edb52eb1f00..11bb79d19aa2d68dbafc4ca5d55eafc8aa58c80d 100644
--- a/gpu/command_buffer/client/context_support.h
+++ b/gpu/command_buffer/client/context_support.h
@@ -43,9 +43,10 @@ class ContextSupport {
 
   virtual void Swap() = 0;
   virtual void PartialSwapBuffers(const gfx::Rect& sub_buffer) = 0;
+  virtual void CommitOverlayPlanes() = 0;
 
   // Schedule a texture to be presented as an overlay synchronously with the
-  // primary surface during the next buffer swap.
+  // primary surface during the next buffer swap or CommitOverlayPlanes.
   // This method is not stateful and needs to be re-scheduled every frame.
   virtual void ScheduleOverlayPlane(int plane_z_order,
                                     gfx::OverlayTransform plane_transform,