Oilpan: Prepare to move EventHandler to Oilpan heap.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 219 matching lines @@
     , m_activeIntervalTimer(this, &EventHandler::activeIntervalTimerFired)
     , m_lastShowPressTimestamp(0)
 {
 }
 
 EventHandler::~EventHandler()
 {
     ASSERT(!m_fakeMouseMoveEventTimer.isActive());
 }
 
+void EventHandler::trace(Visitor* visitor)
+{
+    visitor->trace(m_mousePressNode);
+    visitor->trace(m_capturingMouseEventsNode);
+    visitor->trace(m_nodeUnderMouse);
+    visitor->trace(m_lastNodeUnderMouse);
+    visitor->trace(m_clickNode);
+    visitor->trace(m_dragTarget);
+    visitor->trace(m_frameSetBeingResized);
+    visitor->trace(m_latchedWheelEventNode);
+    visitor->trace(m_previousWheelScrolledNode);
+    visitor->trace(m_targetForTouchID);
+    visitor->trace(m_touchSequenceDocument);
+    visitor->trace(m_scrollGestureHandlingNode);
+    visitor->trace(m_previousGestureScrolledNode);
+    visitor->trace(m_lastDeferredTapElement);
+}
+
 DragState& EventHandler::dragState()
 {
 #if ENABLE(OILPAN)
     DEFINE_STATIC_LOCAL(Persistent<DragState>, state, (new DragState()));
     return *state;
 #else
     DEFINE_STATIC_LOCAL(DragState, state, ());
     return state;
 #endif
 }
@@ skipping 3485 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore