cc: Implement DelegatingRender::drawFrame() method.

cc/output_surface.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_SURFACE_H_
 
 #define USE_CC_OUTPUT_SURFACE // TODO(danakj): Remove this.
 
 #include "cc/cc_export.h"
@@ skipping 36 matching lines @@
   virtual const Capabilities& Capabilities() const = 0;
 
   // Obtain the 3d context or the software device associated with this output
   // surface. Either of these may return a null pointer, but not both.
   // In the event of a lost context, the entire output surface should be
   // recreated.
   virtual WebKit::WebGraphicsContext3D* Context3D() const = 0;
   virtual SoftwareOutputDevice* SoftwareDevice() const = 0;
 
   // Sends frame data to the parent compositor. This should only be called when
-  // capabilities().has_parent_compositor.
-  virtual void SendFrameToParentCompositor(const CompositorFrame&) {}
+  // capabilities().has_parent_compositor. The implementation may destroy or
+  // steal the contents of the CompositorFrame passed in.
+  virtual void SendFrameToParentCompositor(CompositorFrame*) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SURFACE_H_