[GeometryInterface] Add Constructor() at DOMMatrixReadOnly.

third_party/WebKit/Source/core/dom/DOMMatrix.cpp

Index: third_party/WebKit/Source/core/dom/DOMMatrix.cpp
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
index de14957fd2e6b3909b7afadc109e2fbde2207782..731b6f0aedd16e297d8a82d034da7e40ab184885 100644
--- a/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
+++ b/third_party/WebKit/Source/core/dom/DOMMatrix.cpp
@@ -66,10 +66,8 @@ template <typename T>
 DOMMatrix::DOMMatrix(T sequence, int size)
     : DOMMatrixReadOnly(sequence, size) {}
 
-DOMMatrix::DOMMatrix(const TransformationMatrix& matrix, bool is2D) {
-  m_matrix = TransformationMatrix::create(matrix);
-  m_is2D = is2D;
-}
+DOMMatrix::DOMMatrix(const TransformationMatrix& matrix, bool is2D)
+    : DOMMatrixReadOnly(matrix, is2D) {}
 
 DOMMatrix* DOMMatrix::fromMatrix(DOMMatrixInit& other,
                                  ExceptionState& exceptionState) {