cc: Add a test for the elastic overscroll synchronization.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 338 matching lines @@
   TaskGraphRunner* task_graph_runner() const { return task_graph_runner_; }
 
   void OnCommitForSwapPromises();
 
   void RecordGpuRasterizationHistogram();
 
   MicroBenchmarkController micro_benchmark_controller_;
 
   std::unique_ptr<LayerTree> layer_tree_;
 
+  base::WeakPtr<InputHandler> input_handler_weak_ptr_;
+
  private:
   friend class LayerTreeHostSerializationTest;
 
   // This is the number of consecutive frames in which we want the content to be
   // suitable for GPU rasterization before re-enabling it.
   enum { kNumFramesToConsiderBeforeGpuRasterization = 60 };
 
   void ApplyViewportDeltas(ScrollAndScaleSet* info);
   void InitializeProxy(
       std::unique_ptr<Proxy> proxy,
@@ skipping 35 matching lines @@
 
   // |current_output_surface_| can't be updated until we've successfully
   // initialized a new output surface. |new_output_surface_| contains the
   // new output surface that is currently being initialized. If initialization
   // is successful then |new_output_surface_| replaces
   // |current_output_surface_|.
   std::unique_ptr<OutputSurface> new_output_surface_;
   std::unique_ptr<OutputSurface> current_output_surface_;
   bool output_surface_lost_;
 
-  base::WeakPtr<InputHandler> input_handler_weak_ptr_;
-
   const LayerTreeSettings settings_;
   LayerTreeDebugState debug_state_;
 
   bool visible_;
 
   bool has_gpu_rasterization_trigger_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool gpu_rasterization_histogram_recorded_;
 
   // If set, then page scale animation has completed, but the client hasn't been
@@ skipping 17 matching lines @@
   uint32_t surface_client_id_;
   uint32_t next_surface_sequence_;
   uint32_t num_consecutive_frames_suitable_for_gpu_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_