Add hints for potential overlay promotion on android.

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 <memory>
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
+#include "cc/base/resource_id.h"
 #include "cc/output/ca_layer_overlay.h"
 #include "cc/output/overlay_candidate.h"
 #include "cc/quads/render_pass.h"
 
 namespace cc {
 class OutputSurface;
 class ResourceProvider;
 
 class CC_EXPORT OverlayProcessor {
  public:
@@ skipping 18 matching lines @@
   gfx::Rect GetAndResetOverlayDamage();
 
   // Attempt to replace quads from the specified root render pass with overlays
   // or CALayers. This must be called every frame.
   void ProcessForOverlays(ResourceProvider* resource_provider,
                           RenderPass* root_render_pass,
                           OverlayCandidateList* overlay_candidates,
                           CALayerOverlayList* ca_layer_overlays,
                           gfx::Rect* damage_rect);
 
+  bool IsResourcePromotable(ResourceId resource_id);
+
  protected:
   StrategyList strategies_;
   OutputSurface* surface_;
   gfx::Rect overlay_damage_rect_;
   gfx::Rect previous_frame_underlay_rect_;
 
  private:
   bool ProcessForCALayers(ResourceProvider* resource_provider,
                           RenderPass* render_pass,
                           OverlayCandidateList* overlay_candidates,
                           CALayerOverlayList* ca_layer_overlays,
                           gfx::Rect* damage_rect);
   // Update |damage_rect| by removing damage casued by |candidates|.
   void UpdateDamageRect(OverlayCandidateList* candidates,
                         gfx::Rect* damage_rect);
 
   DISALLOW_COPY_AND_ASSIGN(OverlayProcessor);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_PROCESSOR_H_