Add toFloat*Array() methods and use them in layout tests.

Source/core/dom/DOMMatrixReadOnly.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DOMMatrixReadOnly_h
 #define DOMMatrixReadOnly_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 #include "platform/transforms/TransformationMatrix.h"
+#include "wtf/Float32Array.h"
+#include "wtf/Float64Array.h"
 
 namespace blink {
 
 class DOMMatrix;
 
 class DOMMatrixReadOnly : public GarbageCollected<DOMMatrixReadOnly>, public ScriptWrappableBase {
 public:
     double a() const { return m_matrix.m11(); }
     double b() const { return m_matrix.m12(); }
     double c() const { return m_matrix.m21(); }
@@ skipping 20 matching lines @@
 
     bool is2D() const;
     bool isIdentity() const;
 
     DOMMatrix* translate(double tx, double ty, double tz = 0);
     DOMMatrix* scale(double scale, double ox = 0, double oy = 0);
     DOMMatrix* scale3d(double scale, double ox = 0, double oy = 0, double oz = 0);
     DOMMatrix* scaleNonUniform(double sx, double sy = 1, double sz = 1,
         double ox = 0, double oy = 0, double oz = 0);
 
+    PassRefPtr<Float32Array> toFloat32Array() const;
+    PassRefPtr<Float64Array> toFloat64Array() const;
+
     const TransformationMatrix& matrix() const { return m_matrix; }
 
     void trace(Visitor*) { }
 
 protected:
     TransformationMatrix m_matrix;
     bool m_is2D;
 };
 
 } // namespace blink
 
 #endif