IntersectionObserver: second cut.

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

Index: third_party/WebKit/Source/core/dom/IntersectionObserver.idl
diff --git a/third_party/WebKit/Source/core/dom/IntersectionObserver.idl b/third_party/WebKit/Source/core/dom/IntersectionObserver.idl
new file mode 100644
index 0000000000000000000000000000000000000000..a1c45d0a98d76bca60d847d28009d1da3210acff
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserver.idl
@@ -0,0 +1,18 @@
+// Copyright 2015 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.
+
+// http://w3c.github.io/performance-timeline/#idl-def-PerformanceObserverCallback
+callback IntersectionObserverCallback = void (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);
+
+// https://github.com/slightlyoff/IntersectionObserver

[eae, 2015/11/16 23:34:45]

This needs to point to something a bit more official than an individuals git hub
page.

[szager1, 2015/11/19 19:15:38]

I don't think we have anything more official right now; I'll add a TODO to
update the comment.

+[
+    CustomConstructor(IntersectionObserverCallback callback, IntersectionObserverInit options),
+    RuntimeEnabled=IntersectionObserver,
+    WillBeGarbageCollected,
+] interface IntersectionObserver {
+    [RaisesException] void observe(Element target);
+    [RaisesException] void unobserve(Element target);
+    void disconnect();
+    sequence<IntersectionObserverEntry> takeRecords();
+};