Document the proposal and spec bug for ApplicationCacheErrorEvent

Source/core/events/ApplicationCacheErrorEvent.idl

Index: Source/core/events/ApplicationCacheErrorEvent.idl
diff --git a/Source/core/events/ApplicationCacheErrorEvent.idl b/Source/core/events/ApplicationCacheErrorEvent.idl
index 02c1c06450e03144d3ab7d57d767a1d45a688f03..debc4a091f0b83b0e39704653dbff1c59c47515d 100644
--- a/Source/core/events/ApplicationCacheErrorEvent.idl
+++ b/Source/core/events/ApplicationCacheErrorEvent.idl
@@ -2,6 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// ApplicationCache Error Detail Proposal:
+// https://docs.google.com/document/d/1nlk7WgRD3d0ZcfK1xrwBFVZ3DI_e44j7QoMd5gAJC4E/edit
+
+// TODO(philipj): Update the spec link once this is in the HTML spec:
+// https://www.w3.org/Bugs/Public/show_bug.cgi?id=22702
+
 [
     Constructor(DOMString type, optional ApplicationCacheErrorEventInit eventInitDict),
 ] interface ApplicationCacheErrorEvent : Event {