cc : Track ids for which active opacity always wins on property trees

cc/layers/scrollbar_layer_impl_base.cc

 // Copyright 2013 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/layers/scrollbar_layer_impl_base.h"
 
 #include <algorithm>
 #include "cc/trees/layer_tree_impl.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
@@ skipping 22 matching lines @@
 
 void ScrollbarLayerImplBase::PushPropertiesTo(LayerImpl* layer) {
   float active_opacity = layer->opacity();
   LayerImpl::PushPropertiesTo(layer);
   layer->SetOpacity(active_opacity);
   DCHECK(layer->ToScrollbarLayer());
   layer->ToScrollbarLayer()->set_is_overlay_scrollbar(is_overlay_scrollbar_);
   layer->ToScrollbarLayer()->SetScrollLayerId(ScrollLayerId());
 }
 
-void ScrollbarLayerImplBase::DidBecomeActive() {
-  LayerImpl::DidBecomeActive();
-  UpdatePropertyTreeOpacity();
-}
-
 ScrollbarLayerImplBase* ScrollbarLayerImplBase::ToScrollbarLayer() {
   return this;
 }
 
 void ScrollbarLayerImplBase::SetScrollLayerId(int scroll_layer_id) {
   if (scroll_layer_id_ == scroll_layer_id)
     return;
 
   layer_tree_impl()->UnregisterScrollbar(this);
 
@@ skipping 143 matching lines @@
             : thumb_thickness_adjustment,
         thumb_offset,
         thumb_thickness - thumb_thickness_adjustment,
         thumb_length);
   }
 
   return gfx::ToEnclosingRect(thumb_rect);
 }
 
 }  // namespace cc