Implement BroadcastChannel

components/webmessaging/public/interfaces/broadcast_channel.mojom

+// Copyright 2016 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.
+
+module webmessaging.mojom;
+
+import "url/mojo/origin.mojom";
+
+interface BroadcastChannelClient {
+  // Messages are passed as SerializedScriptValue.
+  OnMessage(string message);
+};
+
+interface BroadcastChannelService {
+  // Connect to the channel identified by the |origin| and |name|. Messages can
+  // be sent to the channel using |sender|, and messages to the channel will be
+  // received by |receiver|.
+  // All connections to channels made from the same event loop should be made
+  // through the same BroadcastChannelService to ensure correct ordering of
+  // messages.
+  ConnectToChannel(url.mojom.Origin origin, string name,
+                   associated BroadcastChannelClient receiver,
+                   associated BroadcastChannelClient& sender);
+};