IntersectionObserver: second cut.

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/update/v2/sw.js b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
similarity index 51%
copy from chrome/test/data/extensions/api_test/service_worker/update/v2/sw.js
copy to third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
index a33255c974a272d2cd7100bdd3513b7594957db4..f2ee14e8ee41a5cad9f0be5a87a89fa6519770d8 100644
--- a/chrome/test/data/extensions/api_test/service_worker/update/v2/sw.js
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserverInit.idl
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-this.onmessage = function(e) {
-  e.ports[0].postMessage('Pong from version 2');
-};
+// TODO(szager): link to final spec
 
-this.oninstall = function(e) {
-  e.waitUntil(self.skipWaiting());
+dictionary IntersectionObserverInit {
+    Element? root;
+    DOMString rootMargin;
+    (double or double[]) threshold = 0;
 };