Add platform/transforms pretty printers for logging and testing

third_party/WebKit/Source/platform/transforms/AffineTransform.h

 /*
  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *               2010 Dirk Schulze <krit@webkit.org>
  *
  * 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
@@ skipping 165 matching lines @@
     } DecomposedType;
 
     bool decompose(DecomposedType&) const;
     void recompose(const DecomposedType&);
 
     void copyTransformTo(Transform m)
     {
         memcpy(m, m_transform, sizeof(Transform));
     }
 
+    // If |asMatrix| is true, the transform is returned as a matrix in row-major
+    // order. Otherwise, the transform's decomposition is returned which shows
+    // the translation, scale, etc.
+    String toString(bool asMatrix = false) const;
+
 private:
     void setMatrix(const Transform m)
     {
         if (m && m != m_transform)
             memcpy(m_transform, m, sizeof(Transform));
     }
 
     Transform m_transform;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/TransformPrinters.h.
 void PrintTo(const AffineTransform&, std::ostream*);
 
 } // namespace blink
 
 #endif