Move showLineTreeAndMark() to LayoutBlockFlow.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1625 matching lines @@
         node()->showTreeForThis();
 }
 
 void LayoutObject::showLayoutTreeForThis() const
 {
     showLayoutTree(this, 0);
 }
 
 void LayoutObject::showLineTreeForThis() const
 {
-    if (containingBlock())
-        containingBlock()->showLineTreeAndMark(0, 0, 0, 0, this);
+    if (LayoutBlock* cb = containingBlock()) {
+        if (cb->isLayoutBlockFlow())
+            toLayoutBlockFlow(cb)->showLineTreeAndMark(nullptr, nullptr, nullptr, nullptr, this);
+    }
 }
 
 void LayoutObject::showLayoutObject() const
 {
     showLayoutObject(0);
 }
 
 void LayoutObject::showLayoutObject(int printedCharacters) const
 {
     printedCharacters += fprintf(stderr, "%s %p", decoratedName().ascii().data(), this);
@@ skipping 2030 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif