Oilpan: improve ScrollableArea handling.

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 525 matching lines @@
 
 DEFINE_TRACE(Page)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_animator);
     visitor->trace(m_dragCaretController);
     visitor->trace(m_dragController);
     visitor->trace(m_focusController);
     visitor->trace(m_contextMenuController);
     visitor->trace(m_pointerLockController);
+    visitor->trace(m_scrollingCoordinator);
     visitor->trace(m_undoStack);
     visitor->trace(m_mainFrame);
     visitor->trace(m_validationMessageClient);
     visitor->trace(m_multisamplingChangedObservers);
     visitor->trace(m_frameHost);
     HeapSupplementable<Page>::trace(visitor);
 #endif
     PageLifecycleNotifier::trace(visitor);
 }
 
@@ skipping 38 matching lines @@
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 template class CORE_TEMPLATE_EXPORT WillBeHeapSupplement<Page>;
 
 } // namespace blink