Update from https://crrev.com/307330

cc/trees/layer_tree_host.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <list>
 #include <set>
@@ skipping 205 matching lines @@
   void SetTopControlsHeight(float height);
   void SetTopControlsContentOffset(float offset);
 
   gfx::Size device_viewport_size() const { return device_viewport_size_; }
 
   void ApplyPageScaleDeltaFromImplSide(float page_scale_delta);
   void SetPageScaleFactorAndLimits(float page_scale_factor,
                                    float min_page_scale_factor,
                                    float max_page_scale_factor);
   float page_scale_factor() const { return page_scale_factor_; }
+  gfx::Vector2dF elastic_overscroll() const { return elastic_overscroll_; }
 
   SkColor background_color() const { return background_color_; }
   void set_background_color(SkColor color) { background_color_ = color; }
 
   void set_has_transparent_background(bool transparent) {
     has_transparent_background_ = transparent;
   }
 
   void SetOverhangBitmap(const SkBitmap& bitmap);
 
@@ skipping 185 matching lines @@
   float top_controls_content_offset_;
   float device_scale_factor_;
 
   bool visible_;
 
   base::OneShotTimer<LayerTreeHost> rate_limit_timer_;
 
   float page_scale_factor_;
   float min_page_scale_factor_;
   float max_page_scale_factor_;
+  gfx::Vector2dF elastic_overscroll_;
   bool has_gpu_rasterization_trigger_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool gpu_rasterization_histogram_recorded_;
 
   SkColor background_color_;
   bool has_transparent_background_;
 
   // If set, this texture is used to fill in the parts of the screen not
   // covered by layers.
   scoped_ptr<ScopedUIResource> overhang_ui_resource_;
@@ skipping 40 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_