Adding fromRect to DOMRect and DOMRectReadOnly interfaces following spec.

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

Index: third_party/WebKit/Source/core/dom/DOMRectInit.idl
diff --git a/third_party/WebKit/Source/core/dom/DOMRectInit.idl b/third_party/WebKit/Source/core/dom/DOMRectInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..efb526202a8d2662c85f343c3f808848e0c2c324
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/DOMRectInit.idl
@@ -0,0 +1,12 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.

[zino, 2017/01/11 18:43:35]

nit: Should be 2017

[Byoungkwon Ko, 2017/01/12 17:24:17]

Done.

+// 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-domrectinit
+
+dictionary DOMRectInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double width = 0;
+    unrestricted double height = 0;
+};