Add hints for potential overlay promotion on android.

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/output/overlay_strategy_underlay.h"
 #include "cc/quads/draw_quad.h"
@@ skipping 44 matching lines @@
   overlay_damage_rect_ = render_pass->output_rect;
   *damage_rect = gfx::Rect();
   return true;
 }
 
 void OverlayProcessor::ProcessForOverlays(ResourceProvider* resource_provider,
                                           RenderPass* render_pass,
                                           OverlayCandidateList* candidates,
                                           CALayerOverlayList* ca_layer_overlays,
                                           gfx::Rect* damage_rect) {
+  OverlayCandidateValidator* overlay_validator =
+      surface_->GetOverlayCandidateValidator();
+  overlay_validator->ClearPromotableResources();
+
   // If we have any copy requests, we can't remove any quads for overlays or
   // CALayers because the framebuffer would be missing the removed quads'
   // contents.
   if (!render_pass->copy_requests.empty()) {
     // If overlay processing was skipped for a frame there's no way to be sure
     // of the state of the previous frame, so reset.
     previous_frame_underlay_rect_ = gfx::Rect();
     return;
   }
 
@@ skipping 39 matching lines @@
     }
   }
 
   if (this_frame_underlay_rect == previous_frame_underlay_rect_)
     damage_rect->Subtract(this_frame_underlay_rect);
   previous_frame_underlay_rect_ = this_frame_underlay_rect;
 
   damage_rect->Union(output_surface_overlay_damage_rect);
 }
 
+bool OverlayProcessor::IsResourcePromotable(ResourceId resource_id) {
+  OverlayCandidateValidator* validator =
+      surface_->GetOverlayCandidateValidator();
+  if (!validator)
+    return false;
+
+  return validator->IsResourcePromotable(resource_id);
+}
+
 }  // namespace cc