Make all gesture scrolls use customization path internally

third_party/WebKit/Source/core/page/scrolling/RootScrollerController.h

 // Copyright 2016 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 RootScrollerController_h
 #define RootScrollerController_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 
@@ skipping 34 matching lines @@
     static RootScrollerController* create(
         Document& document,
         ViewportScrollCallback* applyScrollCallback)
     {
         return new RootScrollerController(document, applyScrollCallback);
     }
 
     // Creates an apply scroll callback that handles viewport actions like
     // TopControls movement and Overscroll.
     static ViewportScrollCallback* createViewportApplyScroll(
-        TopControls&, OverscrollController&);
+        TopControls*, OverscrollController*);

[tdresser, 2016/06/23 14:34:29]

We should mention ownership of TopControls and OverscrollController somewhere.

[bokan, 2016/06/23 16:12:30]

Done. Mentioned it here and in ViewportScrollCallback

 
     DECLARE_TRACE();
 
     // Sets the element that will be used as the root scroller. This can be
     // nullptr, in which case we'll use the default element (documentElement) as
     // the effective root scroller.
     void set(Element*);
 
     // Returns the element currently set as the root scroller from script. This
     // differs from the effective root scroller since the set Element may not
@@ skipping 26 matching lines @@
     WeakMember<Document> m_document;
     Member<ViewportScrollCallback> m_viewportApplyScroll;
 
     WeakMember<Element> m_rootScroller;
     WeakMember<Element> m_effectiveRootScroller;
 };
 
 } // namespace blink
 
 #endif // RootScrollerController_h