Update the stringifier behavior for DOMMatrixReadOnly

third_party/WebKit/Source/core/css/CSSMatrix.cpp

 /*
  * Copyright (C) 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 175 matching lines @@
 CSSMatrix* CSSMatrix::skewY(double angle) const {
   if (std::isnan(angle))
     angle = 0;
   return CSSMatrix::Create(TransformationMatrix(*matrix_).SkewY(angle));
 }
 
 String CSSMatrix::toString() const {
   // FIXME - Need to ensure valid CSS floating point values
   // (https://bugs.webkit.org/show_bug.cgi?id=20674)
   if (matrix_->IsAffine())
-    return String::Format("matrix(%f, %f, %f, %f, %f, %f)", matrix_->A(),
+    return String::Format("matrix(%g, %g, %g, %g, %g, %g)", matrix_->A(),

[zino, 2017/06/06 09:20:08]

I mean that this change should not be contained in this CL.

                           matrix_->B(), matrix_->C(), matrix_->D(),
                           matrix_->E(), matrix_->F());
   return String::Format(
-      "matrix3d(%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, "
-      "%f)",
+      "matrix3d(%g, %g, %g, %g, %g, %g, %g, %g, %g, %g, %g, %g, %g, %g, %g, "
+      "%g)",
       matrix_->M11(), matrix_->M12(), matrix_->M13(), matrix_->M14(),
       matrix_->M21(), matrix_->M22(), matrix_->M23(), matrix_->M24(),
       matrix_->M31(), matrix_->M32(), matrix_->M33(), matrix_->M34(),
       matrix_->M41(), matrix_->M42(), matrix_->M43(), matrix_->M44());
 }
 
 }  // namespace blink