Update overlay scrollbars

cc/trees/layer_tree_impl.cc

 // Copyright 2011 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/trees/layer_tree_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/math_util.h"
@@ skipping 335 matching lines @@
     vertical->SetVerticalAdjust(vertical_adjust);
     vertical->SetVisibleToTotalLengthRatio(
         scrollable_viewport.height() / ScrollableSize().height());
   }
 }
 
 void LayerTreeImpl::UpdateDrawProperties() {
   if (IsActiveTree() && RootScrollLayer() && RootContainerLayer())
     UpdateRootScrollLayerSizeDelta();
 
-  if (IsActiveTree() &&
-      RootContainerLayer()
-      && !RootContainerLayer()->masks_to_bounds()) {
+  if (IsActiveTree() && RootContainerLayer())
     UpdateSolidColorScrollbars();
-  }
 
   needs_update_draw_properties_ = false;
   render_surface_layer_list_.clear();
 
   // For max_texture_size.
   if (!layer_tree_host_impl_->renderer())
     return;
 
   if (!root_layer())
     return;
@@ skipping 422 matching lines @@
 const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
     const {
   // Only the active tree needs to know about layers with copy requests, as
   // they are aborted if not serviced during draw.
   DCHECK(IsActiveTree());
 
   return layers_with_copy_output_request_;
 }
 
 }  // namespace cc