Scrollbar Layer revert

cc/test/fake_scrollbar_layer.cc

 // 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.
 
 #include "cc/test/fake_scrollbar_layer.h"
 
 #include "base/auto_reset.h"
 #include "cc/resources/resource_update_queue.h"
 #include "cc/test/fake_scrollbar.h"
 
 namespace cc {
 
 FakeScrollbarLayer::FakeScrollbarLayer(bool paint_during_update,
                                        bool has_thumb,
                                        int scrolling_layer_id)
     : ScrollbarLayer(
           scoped_ptr<Scrollbar>(
               new FakeScrollbar(paint_during_update, has_thumb, false)).Pass(),
           scrolling_layer_id),
       update_count_(0),
-      push_properties_count_(0) {
+      push_properties_count_(0),
+      last_update_full_upload_size_(0),
+      last_update_partial_upload_size_(0) {
   SetAnchorPoint(gfx::PointF(0.f, 0.f));
   SetBounds(gfx::Size(1, 1));
   SetIsDrawable(true);
 }
 
 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_;
+  update_count_++;
+  last_update_full_upload_size_ = queue->FullUploadSize() - full;
+  last_update_partial_upload_size_ = queue->PartialUploadSize() - partial;
   return updated;
 }
 
 void FakeScrollbarLayer::PushPropertiesTo(LayerImpl* layer) {
   ScrollbarLayer::PushPropertiesTo(layer);
   ++push_properties_count_;
 }
 
 scoped_ptr<base::AutoReset<bool> > FakeScrollbarLayer::IgnoreSetNeedsCommit() {
   return make_scoped_ptr(
       new base::AutoReset<bool>(&ignore_set_needs_commit_, true));
 }
 
 }  // namespace cc