Move logic of recording main thread scrolling reasons from cc to blink::ScrollManager

third_party/WebKit/Source/core/input/ScrollManager.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 ScrollManager_h
 #define ScrollManager_h
 
 #include "core/CoreExport.h"
 #include "core/page/EventWithHitTestResults.h"
 #include "platform/geometry/LayoutSize.h"
@@ skipping 93 matching lines @@
 
   Page* page() const;
 
   bool isViewportScrollingElement(const Element&) const;
 
   bool handleScrollGestureOnResizer(Node*, const WebGestureEvent&);
 
   void recomputeScrollChain(const Node& startNode,
                             std::deque<int>& scrollChain);
 
+  // Record non composited main thread scrolling reasons.

[bokan, 2017/03/28 15:30:16]

Nit: comment unneeded.

+  uint32_t computeNonCompositedMainThreadScrollingReasons();
+  void recordNonCompositedMainThreadScrollingReasons(const WebGestureDevice);
+
   // NOTE: If adding a new field to this class please ensure that it is
   // cleared in |ScrollManager::clear()|.
 
   const Member<LocalFrame> m_frame;
 
   // Only used with the ScrollCustomization runtime enabled feature.
   std::deque<int> m_currentScrollChain;
 
   Member<Node> m_scrollGestureHandlingNode;
 
@@ skipping 16 matching lines @@
 
   Member<PaintLayerScrollableArea> m_resizeScrollableArea;
 
   LayoutSize
       m_offsetFromResizeCorner;  // In the coords of m_resizeScrollableArea.
 };
 
 }  // namespace blink
 
 #endif  // ScrollManager_h