Implement navigator.sendBeacon()

Source/modules/beacon/NavigatorBeacon.idl

Index: Source/modules/beacon/NavigatorBeacon.idl
diff --git a/Source/modules/beacon/NavigatorBeacon.idl b/Source/modules/beacon/NavigatorBeacon.idl
new file mode 100644
index 0000000000000000000000000000000000000000..589aa663946e0c2bc3e0a5094fcaf95a7468fd01
--- /dev/null
+++ b/Source/modules/beacon/NavigatorBeacon.idl
@@ -0,0 +1,13 @@
+// Copyright 2014 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.
+
+[
+    RuntimeEnabled=Beacon,
+] partial interface Navigator {
+    [ CallWith=ExecutionContext, RaisesException ] boolean sendBeacon(DOMString url, ArrayBufferView data);
+    [ CallWith=ExecutionContext, RaisesException ] boolean sendBeacon(DOMString url, Blob data);
+    [ CallWith=ExecutionContext, RaisesException ] boolean sendBeacon(DOMString url, FormData data);
+    [ CallWith=ExecutionContext, RaisesException ] boolean sendBeacon(DOMString url, [Default=Undefined] optional DOMString data);
+};
+