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

Source/platform/text/TextStream.h

 /*
  * Copyright (C) 2004, 2008 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 21 matching lines @@
 #include "wtf/text/StringBuilder.h"
 #include "wtf/unicode/Unicode.h"
 
 namespace blink {
 
 class IntPoint;
 class IntRect;
 class FloatPoint;
 class FloatRect;
 class FloatSize;
+class LayoutUnit;
+class LayoutPoint;
+class LayoutRect;
+class LayoutSize;
 
 class PLATFORM_EXPORT TextStream {
 public:
     struct FormatNumberRespectingIntegers {
         FormatNumberRespectingIntegers(double number) : value(number) { }
         double value;
     };
 
     TextStream& operator<<(bool);
     TextStream& operator<<(int);
@@ skipping 13 matching lines @@
 
 private:
     StringBuilder m_text;
 };
 
 PLATFORM_EXPORT TextStream& operator<<(TextStream&, const IntPoint&);
 PLATFORM_EXPORT TextStream& operator<<(TextStream&, const IntRect&);
 PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatPoint&);
 PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatSize&);
 PLATFORM_EXPORT TextStream& operator<<(TextStream&, const FloatRect&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const LayoutUnit&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const LayoutPoint&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const LayoutRect&);
+PLATFORM_EXPORT TextStream& operator<<(TextStream&, const LayoutSize&);
 
 PLATFORM_EXPORT void writeIndent(TextStream&, int indent);
 
 template<typename Item>
 TextStream& operator<<(TextStream& ts, const Vector<Item>& vector)
 {
     ts << "[";
 
     unsigned size = vector.size();
     for (unsigned i = 0; i < size; ++i) {
         ts << vector[i];
         if (i < size - 1)
             ts << ", ";
     }
 
     ts << "]";
     return ts;
 }
 
 }
 
 #endif