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..4c4b6b8a56c6081c9c79e5e00de2474b0c9eb1f3 100644
--- a/gpu/command_buffer/client/context_support.h
+++ b/gpu/command_buffer/client/context_support.h
@@ -33,6 +33,14 @@ 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.
+  virtual void ScheduleOverlayPlane(int plane_z_order,
+                                    unsigned plane_transform,

[piman, 2014/03/25 00:08:08]

nit: it'd make sense to have the enum down to gpu/ so that we can use it here.

+                                    unsigned overlay_texture_id,
+                                    const gfx::Rect& display_bounds,
+                                    gfx::RectF crop_rect) = 0;
+
  protected:
   ContextSupport() {}
   virtual ~ContextSupport() {}