ResizeObserver pt1: IDLs with stubs

third_party/WebKit/Source/core/observer/ResizeObserver.idl

Index: third_party/WebKit/Source/core/observer/ResizeObserver.idl
diff --git a/third_party/WebKit/Source/core/observer/ResizeObserver.idl b/third_party/WebKit/Source/core/observer/ResizeObserver.idl
new file mode 100644
index 0000000000000000000000000000000000000000..fc4a3187abb85209afabf127956f2b58f4aa1f56
--- /dev/null
+++ b/third_party/WebKit/Source/core/observer/ResizeObserver.idl
@@ -0,0 +1,15 @@
+// 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.
+
+// Standards spec at https://github.com/WICG/ResizeObserver
+
+[
+    Constructor(ResizeObserverCallback callback),
+    ConstructorCallWith=Document,
+    RuntimeEnabled=ResizeObserver,
+] interface ResizeObserver {
+    void observe(Element target);
+    void unobserve(Element target);
+    void disconnect();
+};