Oilpan: extend tracing over WebFrame trees.

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 663 matching lines @@
     // Only for testing purpose:
     // Returns true if selection.anchorNode has a marker on range from |from| with |length|.
     virtual bool selectionStartHasSpellingMarkerFor(int from, int length) const = 0;
 
     // Dumps the layer tree, used by the accelerated compositor, in
     // text form. This is used only by layout tests.
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const = 0;
 
 #if BLINK_IMPLEMENTATION
     static WebFrame* fromFrame(Frame*);
-    static void traceChildren(Visitor*, WebFrame*);
+    static void traceFrames(Visitor*, WebFrame*);
+    static void clearWeakFrames(Visitor*, WebFrame*);
 #endif
 
 protected:
-    explicit WebFrame();
+    WebFrame();
     virtual ~WebFrame();
 
 private:
     friend class OpenedFrameTracker;
 
+#if BLINK_IMPLEMENTATION
+    static void traceFrame(Visitor*, WebFrame*);
+    static bool isAlive(Visitor*, WebFrame*);
+#endif
+
     WebFrame* m_parent;
     WebFrame* m_previousSibling;
     WebFrame* m_nextSibling;
     WebFrame* m_firstChild;
     WebFrame* m_lastChild;
 
     WebFrame* m_opener;
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif