Update overlay scrollbars

cc/layers/painted_scrollbar_layer_impl.h

 // 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.
 
 #ifndef CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
 #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
 #include "cc/layers/scrollbar_layer_impl_base.h"
@@ skipping 37 matching lines @@
  protected:
   PaintedScrollbarLayerImpl(LayerTreeImpl* tree_impl,
                             int id,
                             ScrollbarOrientation orientation);
 
   // ScrollbarLayerImplBase implementation.
   virtual int ThumbThickness() const OVERRIDE;
   virtual int ThumbLength() const OVERRIDE;
   virtual float TrackLength() const OVERRIDE;
   virtual int TrackStart() const OVERRIDE;
+  virtual bool IsThumbResizable() const OVERRIDE;
 
  private:
   virtual const char* LayerTypeAsString() const OVERRIDE;
 
   UIResourceId track_ui_resource_id_;
   UIResourceId thumb_ui_resource_id_;
 
   int thumb_thickness_;
   int thumb_length_;
   int track_start_;
   int track_length_;
 
   // Difference between the clip layer's height and the visible viewport
   // height (which may differ in the presence of top-controls hiding).
   float vertical_adjust_;
 
   int scroll_layer_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintedScrollbarLayerImpl);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_IMPL_H_