Extract more of the mouse logic from EventHandler

third_party/WebKit/Source/core/input/ScrollManager.cpp

 // 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.
 
 #include "core/input/ScrollManager.h"
 
 #include "core/dom/DOMNodeIds.h"
 #include "core/events/GestureEvent.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
@@ skipping 22 matching lines @@
 }
 
 void ScrollManager::clear() {
   m_lastGestureScrollOverWidget = false;
   m_scrollbarHandlingScrollGesture = nullptr;
   m_resizeScrollableArea = nullptr;
   m_offsetFromResizeCorner = LayoutSize();
   clearGestureScrollState();
 }
 
+DEFINE_TRACE(ScrollManager) {
+  visitor->trace(m_frame);
+  visitor->trace(m_scrollGestureHandlingNode);
+  visitor->trace(m_previousGestureScrolledNode);
+  visitor->trace(m_scrollbarHandlingScrollGesture);
+  visitor->trace(m_resizeScrollableArea);
+}
+
 void ScrollManager::clearGestureScrollState() {
   m_scrollGestureHandlingNode = nullptr;
   m_previousGestureScrolledNode = nullptr;
   m_deltaConsumedForScrollSequence = false;
   m_currentScrollChain.clear();
 
   if (FrameHost* host = frameHost()) {
     bool resetX = true;
     bool resetY = true;
     host->overscrollController().resetAccumulated(resetX, resetY);
@@ skipping 470 matching lines @@
     bool shouldUpdateCapture = false;
     if (scrollbar->gestureEvent(targetedEvent.event(), &shouldUpdateCapture)) {
       if (shouldUpdateCapture)
         m_scrollbarHandlingScrollGesture = scrollbar;
       return true;
     }
   }
   return false;
 }
 
-DEFINE_TRACE(ScrollManager) {
-  visitor->trace(m_frame);
-  visitor->trace(m_scrollGestureHandlingNode);
-  visitor->trace(m_previousGestureScrolledNode);
-  visitor->trace(m_scrollbarHandlingScrollGesture);
-  visitor->trace(m_resizeScrollableArea);
-}
-
 }  // namespace blink