Move have_wheel_event_handlers to WebLayerTreeView.

content/test/web_layer_tree_view_impl_for_testing.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 CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_
 #define CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/test/test_task_graph_runner.h"
@@ skipping 49 matching lines @@
   void setDeferCommits(bool defer_commits) override;
   void registerForAnimations(blink::WebLayer* layer) override;
   void registerViewportLayers(
       const blink::WebLayer* overscrollElasticityLayer,
       const blink::WebLayer* pageScaleLayerLayer,
       const blink::WebLayer* innerViewportScrollLayer,
       const blink::WebLayer* outerViewportScrollLayer) override;
   void clearViewportLayers() override;
   void registerSelection(const blink::WebSelection& selection) override;
   void clearSelection() override;
 

[Charlie Reis, 2016/01/28 23:44:00]

nit: No blank line here, since it's still part of the WebLayerTreeView block of
overrides.

+  void setHaveWheelEventHandlers(bool have_event_handlers) override;
+  bool haveWheelEventHandlers() const override;
+
   // cc::LayerTreeHostClient implementation.
   void WillBeginMainFrame() override {}
   void DidBeginMainFrame() override {}
   void BeginMainFrame(const cc::BeginFrameArgs& args) override {}
   void BeginMainFrameNotExpectedSoon() override {}
   void UpdateLayerTreeHost() override;
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
@@ skipping 18 matching lines @@
  private:
   cc::TestTaskGraphRunner task_graph_runner_;
   scoped_ptr<cc::LayerTreeHost> layer_tree_host_;
 
   DISALLOW_COPY_AND_ASSIGN(WebLayerTreeViewImplForTesting);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_WEB_LAYER_TREE_VIEW_IMPL_FOR_TESTING_H_