GeometryInterface: Add DOMMatrixInit and fromMatrix().

third_party/WebKit/Source/core/dom/DOMMatrixInit.idl

Index: third_party/WebKit/Source/core/dom/DOMMatrixInit.idl
diff --git a/third_party/WebKit/Source/core/dom/DOMMatrixInit.idl b/third_party/WebKit/Source/core/dom/DOMMatrixInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..87534ea34ffeab8797f8a47008025ead9cfc5209
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/DOMMatrixInit.idl
@@ -0,0 +1,31 @@
+// Copyright 2016 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.
+
+// https://drafts.fxtf.org/geometry/#dictdef-dommatrixinit
+
+dictionary DOMMatrixInit {
+    unrestricted double a;
+    unrestricted double b;
+    unrestricted double c;
+    unrestricted double d;
+    unrestricted double e;
+    unrestricted double f;
+    unrestricted double m11;
+    unrestricted double m12;
+    unrestricted double m13 = 0;
+    unrestricted double m14 = 0;
+    unrestricted double m21;
+    unrestricted double m22;
+    unrestricted double m23 = 0;
+    unrestricted double m24 = 0;
+    unrestricted double m31 = 0;
+    unrestricted double m32 = 0;
+    unrestricted double m33 = 1;
+    unrestricted double m34 = 0;
+    unrestricted double m41;
+    unrestricted double m42;
+    unrestricted double m43 = 0;
+    unrestricted double m44 = 1;
+    boolean is2D;
+};