[oilpan] Move EventHandler to the heap

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 09a9245b32e5bfe8025e4b12bc9ee988429905c1..4e1bef94e729836bde5fced3805147658b236ddc 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -111,6 +111,8 @@
 
 namespace WebCore {
 
+DEFINE_GC_MAP(EventHandler);
+
 using namespace HTMLNames;
 
 // The link drag hysteresis is much larger than the others because there
@@ -4009,4 +4011,20 @@ unsigned EventHandler::accessKeyModifiers()
 #endif
 }
 
+void EventHandler::accept(Visitor* visitor) const
+{
+    visitor->visit(m_mousePressNode);
+    visitor->visit(m_capturingMouseEventsNode);
+    visitor->visit(m_nodeUnderMouse);
+    visitor->visit(m_lastNodeUnderMouse);
+    visitor->visit(m_clickNode);
+    visitor->visit(m_dragTarget);
+    visitor->visit(m_frameSetBeingResized);
+    visitor->visit(m_latchedWheelEventNode);
+    visitor->visit(m_previousWheelScrolledNode);
+    visitor->visit(m_originatingTouchPointDocument);
+    visitor->visit(m_scrollGestureHandlingNode);
+    visitor->visit(m_previousGestureScrolledNode);
+}
+
 } // namespace WebCore