Implement skew*() methods in DOMMatrix.

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 45250069b99bdf370a0e1f30e4554c794222c4fe..38f8344d64ce65ea2ec06e2c0f25ec3a532ef43e 100644
--- a/Source/core/dom/DOMMatrixReadOnly.cpp
+++ b/Source/core/dom/DOMMatrixReadOnly.cpp
@@ -82,4 +82,14 @@ DOMMatrix* DOMMatrixReadOnly::rotateAxisAngle(double x, double y, double z, doub
     return DOMMatrix::create(this)->rotateAxisAngleSelf(x, y, z, angle);
 }
 
+DOMMatrix* DOMMatrixReadOnly::skewX(double sx)
+{
+    return DOMMatrix::create(this)->skewXSelf(sx);
+}
+
+DOMMatrix* DOMMatrixReadOnly::skewY(double sy)
+{
+    return DOMMatrix::create(this)->skewYSelf(sy);
+}
+
 } // namespace blink