Plumb overlay processing into DirectRenderer.

cc/output/overlay_processor.h

 // Copyright 2014 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_OVERLAY_PROCESSOR_H_
 #define CC_OUTPUT_OVERLAY_PROCESSOR_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 14 matching lines @@
     // |render_passes_in_draw_order|.
     virtual bool Attempt(RenderPassList* render_passes_in_draw_order) = 0;
   };
   typedef ScopedPtrVector<Strategy> StrategyList;
 
   OverlayProcessor(OutputSurface* surface, ResourceProvider* resource_provider);
   virtual ~OverlayProcessor();
   // Virtual to allow testing different strategies.
   virtual void Initialize();
 
-  void ProcessForOverlays(RenderPassList* render_passes_in_draw_order);
+  bool ProcessForOverlays(RenderPassList* render_passes_in_draw_order);
 
  protected:
   StrategyList strategies_;
   OutputSurface* surface_;
   ResourceProvider* resource_provider_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OverlayProcessor);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_PROCESSOR_H_