Change ScrollbarLayer to use UI resource

cc/test/fake_scrollbar_layer.h

 // Copyright 2012 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_TEST_FAKE_SCROLLBAR_LAYER_H_
 #define CC_TEST_FAKE_SCROLLBAR_LAYER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/scrollbar_layer.h"
 
 namespace base { template<typename T> class AutoReset; }
 
 namespace cc {
 
 class FakeScrollbarLayer : public ScrollbarLayer {
  public:
   static scoped_refptr<FakeScrollbarLayer> Create(bool paint_during_update,
                                                   bool has_thumb,
                                                   int scrolling_layer_id) {
     return make_scoped_refptr(new FakeScrollbarLayer(
         paint_during_update, has_thumb, scrolling_layer_id));
   }
 
   int update_count() const { return update_count_; }
   void reset_update_count() { update_count_ = 0; }
-  size_t last_update_full_upload_size() const {
-    return last_update_full_upload_size_;
-  }
-  size_t last_update_partial_upload_size() const {
-    return last_update_partial_upload_size_;
-  }
 
   virtual bool Update(ResourceUpdateQueue* queue,
                       const OcclusionTracker* occlusion) OVERRIDE;
 
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
   scoped_ptr<base::AutoReset<bool> > IgnoreSetNeedsCommit();
 
   size_t push_properties_count() const { return push_properties_count_; }
   void reset_push_properties_count() { push_properties_count_ = 0; }
 
+  // For unit tests
+  UIResourceId track_resource_id() {
+    return ScrollbarLayer::track_resource_id();
+  }
+  UIResourceId thumb_resource_id() {
+    return ScrollbarLayer::thumb_resource_id();
+  }
+
  private:
   FakeScrollbarLayer(bool paint_during_update,
                      bool has_thumb,
                      int scrolling_layer_id);
   virtual ~FakeScrollbarLayer();
 
   int update_count_;
   size_t push_properties_count_;
-  size_t last_update_full_upload_size_;
-  size_t last_update_partial_upload_size_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_SCROLLBAR_LAYER_H_