Change ScrollbarLayer to use UI resource

cc/test/fake_scrollbar_layer.cc

Index: cc/test/fake_scrollbar_layer.cc
diff --git a/cc/test/fake_scrollbar_layer.cc b/cc/test/fake_scrollbar_layer.cc
index 64e08adf5f8611da6455fd74f6c29a1f53ee1c23..77cf82616ac145f9fa2d8914bf19dfb9ecefccc0 100644
--- a/cc/test/fake_scrollbar_layer.cc
+++ b/cc/test/fake_scrollbar_layer.cc
@@ -18,9 +18,7 @@ FakeScrollbarLayer::FakeScrollbarLayer(bool paint_during_update,
               new FakeScrollbar(paint_during_update, has_thumb, false)).Pass(),
           scrolling_layer_id),
       update_count_(0),
-      push_properties_count_(0),
-      last_update_full_upload_size_(0),
-      last_update_partial_upload_size_(0) {
+      push_properties_count_(0) {
   SetAnchorPoint(gfx::PointF(0.f, 0.f));
   SetBounds(gfx::Size(1, 1));
   SetIsDrawable(true);
@@ -30,12 +28,8 @@ FakeScrollbarLayer::~FakeScrollbarLayer() {}
 
 bool FakeScrollbarLayer::Update(ResourceUpdateQueue* queue,
                                 const OcclusionTracker* occlusion) {
-  size_t full = queue->FullUploadSize();
-  size_t partial = queue->PartialUploadSize();
   bool updated = ScrollbarLayer::Update(queue, occlusion);
-  update_count_++;
-  last_update_full_upload_size_ = queue->FullUploadSize() - full;
-  last_update_partial_upload_size_ = queue->PartialUploadSize() - partial;
+  ++update_count_;
   return updated;
 }