Intersection Observer first draft

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

Index: third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
diff --git a/chrome/test/data/extensions/api_test/service_worker/background/post_message_to_sw.js b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
similarity index 56%
copy from chrome/test/data/extensions/api_test/service_worker/background/post_message_to_sw.js
copy to third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
index be9ae08c6fd493a13f15b480a483529f122d1872..392bedd04d7643bfd343c41324eb0b183b87e49d 100644
--- a/chrome/test/data/extensions/api_test/service_worker/background/post_message_to_sw.js
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-'use strict';
+// Spec: http://dom.spec.whatwg.org/#idl-def-IntersectionObserverInit
 
-self.onmessage = function(e) {
-  e.data.port.postMessage(e.data.message);
+dictionary IntersectionObserverInit {
+    Element? viewport;
 };