compositor-worker: plumb element id and mutable properties

cc/blink/web_layer_impl.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_BLINK_WEB_LAYER_IMPL_H_
 #define CC_BLINK_WEB_LAYER_IMPL_H_
 
 #include <string>
 #include <utility>
 
@@ skipping 128 matching lines @@
   blink::WebVector<std::pair<int64_t, blink::WebRect>> frameTimingRequests()
       const override;
   void setIsContainerForFixedPositionLayers(bool is_container) override;
   bool isContainerForFixedPositionLayers() const override;
   void setPositionConstraint(
       const blink::WebLayerPositionConstraint& constraint) override;
   blink::WebLayerPositionConstraint positionConstraint() const override;
   void setScrollClient(blink::WebLayerScrollClient* client) override;
   bool isOrphan() const override;
   void setWebLayerClient(blink::WebLayerClient* client) override;
+  void setElementId(uint64_t id) override;
+  uint64_t elementId() const override;
+  void setMutableProperties(uint32_t properties) override;
+  uint32_t mutableProperties() const override;
 
   // LayerClient implementation.
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> TakeDebugInfo()
       override;
 
   void setScrollParent(blink::WebLayer* parent) override;
   void setClipParent(blink::WebLayer* parent) override;
 
  protected:
   scoped_refptr<cc::Layer> layer_;
   blink::WebLayerClient* web_layer_client_;
 
   bool contents_opaque_is_fixed_;
 
  private:
   scoped_ptr<WebToCCAnimationDelegateAdapter> animation_delegate_adapter_;
 
   DISALLOW_COPY_AND_ASSIGN(WebLayerImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_LAYER_IMPL_H_