Plumb overlay processing into DirectRenderer.

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 b5e771368c06de4f13bdb728f5bbbec2b3e79fe8..7344d1e6046e2881fc304f1b830a451239581c46 100644
--- a/gpu/command_buffer/client/context_support.h
+++ b/gpu/command_buffer/client/context_support.h
@@ -33,6 +33,15 @@ class ContextSupport {
   virtual void SetSwapBuffersCompleteCallback(
       const base::Closure& callback) = 0;
 
+  // Schedule a texture to be presented as an overlay synchronously with the
+  // primary surface during the next buffer swap.
+  // This method is not stateful and needs to be re-scheduled every frame.
+  virtual void ScheduleOverlayPlane(int plane_z_order,
+                                    unsigned plane_transform,
+                                    unsigned overlay_texture_id,
+                                    const gfx::Rect& display_bounds,
+                                    const gfx::RectF& uv_rect) = 0;
+
  protected:
   ContextSupport() {}
   virtual ~ContextSupport() {}