Implement BroadcastChannel

components/webmessaging/public/interfaces/broadcast_channel.mojom

Index: components/webmessaging/public/interfaces/broadcast_channel.mojom
diff --git a/components/webmessaging/public/interfaces/broadcast_channel.mojom b/components/webmessaging/public/interfaces/broadcast_channel.mojom
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+// 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";
+
+// A pair of BroadcastChannelClient interfaces is used to represent a connection
+// to a particular channel. One client is implemented in the browser, for
+// messages sent from the renderer to the browser, and one client is implemented
+// in the renderer for messages from the browser to the renderer.
+interface BroadcastChannelClient {
+  // Messages are passed as SerializedScriptValue.
+  OnMessage(string message);
+};
+
+// This interface is used to set up connections to broadcast channels. All
+// connections to channels made from the same event loop should be made
+// through the same BroadcastChannelProvider connection to ensure correct
+// ordering of messages.
+// Typically the browser will have one instance of a BroadcastChannelProvider
+// per storage partition, to which all connections from renderers in that
+// partition are bound. This instance will then forward messages received on a
+// particular connection to all other connections in the same storage partition
+// with the same origin and name.
+interface BroadcastChannelProvider {
+  // 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|.
+  ConnectToChannel(url.mojom.Origin origin, string name,
+                   associated BroadcastChannelClient receiver,
+                   associated BroadcastChannelClient& sender);
+};