Add option to dump line box tree when dumping layout tree.

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 83 matching lines @@
 // cross-site.
 // WebFrame is the base class for both WebLocalFrame and WebRemoteFrame and
 // contains methods that are valid on both local and remote frames, such as
 // getting a frame's parent or its opener.
 class WebFrame {
 public:
     // Control of layoutTreeAsText output
     enum LayoutAsTextControl {
         LayoutAsTextNormal = 0,
         LayoutAsTextDebug = 1 << 0,
-        LayoutAsTextPrinting = 1 << 1
+        LayoutAsTextPrinting = 1 << 1,
+        LayoutAsTextWithLineTrees = 1 << 2
     };
     typedef unsigned LayoutAsTextControls;
 
     // FIXME: We already have blink::TextGranularity. For now we support only
     // a part of blink::TextGranularity.
     // Ideally it seems blink::TextGranularity should be broken up into
     // blink::TextGranularity and perhaps blink::TextBoundary and then
     // TextGranularity enum could be moved somewhere to public/, and we could
     // just use it here directly without introducing a new enum.
     enum TextGranularity {
@@ skipping 618 matching lines @@
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif