Plumb overlay processing into DirectRenderer.

cc/output/overlay_processor.cc

 // 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.
 
 #include "cc/output/overlay_processor.h"
 
 #include "cc/output/output_surface.h"
 #include "cc/output/overlay_strategy_single_on_top.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
@@ skipping 12 matching lines @@
   OverlayCandidateValidator* candidates =
       surface_->overlay_candidate_validator();
   if (candidates) {
     strategies_.push_back(scoped_ptr<Strategy>(
         new OverlayStrategySingleOnTop(candidates, resource_provider_)));
   }
 }
 
 OverlayProcessor::~OverlayProcessor() {}
 
-void OverlayProcessor::ProcessForOverlays(
+bool OverlayProcessor::ProcessForOverlays(
     RenderPassList* render_passes_in_draw_order) {
   for (StrategyList::iterator it = strategies_.begin(); it != strategies_.end();
        ++it) {
     if ((*it)->Attempt(render_passes_in_draw_order))
-      return;
+      return true;
   }
+  return false;
 }
 
 }  // namespace cc