[not for review - epic CL] Adding Elastic+Momentum+Layered scrolling to views::ScrollView

cc/trees/layer_tree_host_unittest_scroll.cc

 // 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 1827 matching lines @@
         FROM_HERE,
         base::Bind(&LayerTreeHostScrollTestElasticOverscroll::BindInputHandler,
                    base::Unretained(this),
                    layer_tree_host()->GetInputHandler()));
     PostSetNeedsCommitToMainThread();
   }
 
   void BindInputHandler(const base::WeakPtr<InputHandler> input_handler) {
     DCHECK(task_runner_provider()->IsImplThread());
     input_handler->BindToClient(&input_handler_client_);
-    scroll_elasticity_helper_ = input_handler->CreateScrollElasticityHelper();
+    scroll_elasticity_helper_ =
+        input_handler->CreateRootScrollElasticityHelper();
     DCHECK(scroll_elasticity_helper_);
   }
 
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float scale,
                            float top_controls_delta) override {
     DCHECK_NE(0, num_begin_main_frames_main_thread_)
         << "The first BeginMainFrame has no deltas to report";
@@ skipping 114 matching lines @@
 
   const gfx::Vector2dF elastic_overscroll_test_cases_[5] = {
       gfx::Vector2dF(0, 0), gfx::Vector2dF(5, 10), gfx::Vector2dF(5, 5),
       gfx::Vector2dF(-4, -5), gfx::Vector2dF(0, 0)};
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestElasticOverscroll);
 
 }  // namespace
 }  // namespace cc