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

Source/core/dom/DOMMatrixReadOnly.cpp

Index: Source/core/dom/DOMMatrixReadOnly.cpp
diff --git a/Source/core/dom/DOMMatrixReadOnly.cpp b/Source/core/dom/DOMMatrixReadOnly.cpp
index 40de8340d88080c989cec20dd278657950403d6c..13dee54fa792a0130f283825c578da7ec934670c 100644
--- a/Source/core/dom/DOMMatrixReadOnly.cpp
+++ b/Source/core/dom/DOMMatrixReadOnly.cpp
@@ -38,4 +38,28 @@ DOMMatrix* DOMMatrixReadOnly::scaleNonUniform(double sx, double sy, double sz,
     return DOMMatrix::create(this)->scaleNonUniformSelf(sx, sy, sz, ox, oy, oz);
 }
 
+PassRefPtr<Float32Array> DOMMatrixReadOnly::toFloat32Array() const
+{
+    float array[] = {
+        m_matrix.m11(), m_matrix.m12(), m_matrix.m13(), m_matrix.m14(),
+        m_matrix.m21(), m_matrix.m22(), m_matrix.m23(), m_matrix.m24(),
+        m_matrix.m31(), m_matrix.m32(), m_matrix.m33(), m_matrix.m34(),
+        m_matrix.m41(), m_matrix.m42(), m_matrix.m43(), m_matrix.m44()
+    };
+
+    return Float32Array::create(array, 16);
+}
+
+PassRefPtr<Float64Array> DOMMatrixReadOnly::toFloat64Array() const
+{
+    double array[] = {
+        m_matrix.m11(), m_matrix.m12(), m_matrix.m13(), m_matrix.m14(),
+        m_matrix.m21(), m_matrix.m22(), m_matrix.m23(), m_matrix.m24(),
+        m_matrix.m31(), m_matrix.m32(), m_matrix.m33(), m_matrix.m34(),
+        m_matrix.m41(), m_matrix.m42(), m_matrix.m43(), m_matrix.m44()
+    };
+
+    return Float64Array::create(array, 16);
+}
+
 } // namespace blink