Add argument to pass elastic overscroll delta to Blink (Chrome side)

cc/test/fake_layer_tree_host_client.h

 // Copyright 2012 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_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/input/input_handler.h"
 #include "cc/test/test_context_provider.h"
@@ skipping 18 matching lines @@
   // Caller responsible for unsetting this and maintaining the host's lifetime.
   void SetLayerTreeHost(LayerTreeHost* host) { host_ = host; }
 
   // LayerTreeHostClient implementation.
   void WillBeginMainFrame(int frame_id) override {}
   void DidBeginMainFrame() override {}
   void BeginMainFrame(const BeginFrameArgs& args) override {}
   void Layout() override {}
   void ApplyViewportDeltas(const gfx::Vector2d& inner_delta,
                            const gfx::Vector2d& outer_delta,
+                           const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
                            float top_controls_delta) override {}
   void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
                            float page_scale,
                            float top_controls_delta) override {}
 
   void RequestNewOutputSurface(bool fallback) override;
   void DidInitializeOutputSurface() override {}
   void WillCommit() override {}
   void DidCommit() override {}
   void DidCommitAndDrawFrame() override {}
   void DidCompleteSwapBuffers() override {}
 
   // LayerTreeHostSingleThreadClient implementation.
   void DidPostSwapBuffers() override {}
   void DidAbortSwapBuffers() override {}
 
  private:
   bool use_software_rendering_;
   bool use_delegating_renderer_;
 
   LayerTreeHost* host_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_CLIENT_H_