Oilpan: make shutdown of plugin container objects work better.

Source/platform/Widget.h

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Collabora Ltd.  All rights reserved.
  * Copyright (C) 2013 Google Inc.  All rights reserved.
  *
  * 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 21 matching lines @@
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class Event;
 class GraphicsContext;
 class HostWindow;
+#if ENABLE(OILPAN)

[tkent, 2014/06/25 05:05:40]

nit: You don't need to add |#if ENABLE(OILPAN)| to class declarations. It
doesn't affect generated code of enable_oilpan=0.

+class ScriptController;
+#endif
 
 // The Widget class serves as a base class for three kinds of objects:
 // (1) Scrollable areas (ScrollView)
 // (2) Scrollbars (Scrollbar)
 // (3) Plugins (PluginView)
 //
 // Widgets are connected in a hierarchy, with the restriction that plugins and
 // scrollbars are always leaves of the tree. Only ScrollViews can have children
 // (and therefore the Widget class has no concept of children).
 class PLATFORM_EXPORT Widget : public RefCounted<Widget> {
@@ skipping 74 matching lines @@
     virtual IntPoint convertToContainingView(const IntPoint&) const;
     virtual IntPoint convertFromContainingView(const IntPoint&) const;
 
     // Virtual methods to convert points to/from child widgets
     virtual IntPoint convertChildToSelf(const Widget*, const IntPoint&) const;
     virtual IntPoint convertSelfToChild(const Widget*, const IntPoint&) const;
 
     // Notifies this widget that it will no longer be receiving events.
     virtual void eventListenersRemoved() { }
 
+#if ENABLE(OILPAN)
+    virtual void detach() { }
+
+    virtual void setScriptController(ScriptController*) { }
+#endif
+
 private:
     Widget* m_parent;
     IntRect m_frame;
     bool m_selfVisible;
     bool m_parentVisible;
 };
 
 } // namespace WebCore
 
 #endif // Widget_h