Add hints for potential overlay promotion on android.

cc/output/overlay_processor.cc

Index: cc/output/overlay_processor.cc
diff --git a/cc/output/overlay_processor.cc b/cc/output/overlay_processor.cc
index 7996ce6789f5c0eb20c6acb1641848028a149cfd..40ac45228dca51e17b7235c5876425098bc42991 100644
--- a/cc/output/overlay_processor.cc
+++ b/cc/output/overlay_processor.cc
@@ -62,6 +62,10 @@ void OverlayProcessor::ProcessForOverlays(ResourceProvider* resource_provider,
                                           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.
@@ -121,4 +125,13 @@ void OverlayProcessor::UpdateDamageRect(OverlayCandidateList* candidates,
   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