Add a content API to create a message channel.

android_webview/java/src/org/chromium/android_webview/MessageChannel.java

Index: android_webview/java/src/org/chromium/android_webview/MessageChannel.java
diff --git a/android_webview/java/src/org/chromium/android_webview/MessageChannel.java b/android_webview/java/src/org/chromium/android_webview/MessageChannel.java
new file mode 100644
index 0000000000000000000000000000000000000000..92486244618ad8a7eb30c2f506152d0732e37fbb
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/MessageChannel.java
@@ -0,0 +1,28 @@
+// 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.
+
+package org.chromium.android_webview;
+
+/**
+ * Represents the MessageChannel object. Inspired from
+ * http://www.whatwg.org/specs/web-apps/current-work/multipage/web-messaging.html#message-channels
+ */
+public class MessageChannel {
+    // The message port IDs of port1 and port2.
+    private int mPort1;
+    private int mPort2;
+
+    public MessageChannel(int port1, int port2) {
+        mPort1 = port1;
+        mPort2 = port2;
+    }
+
+    public int port1() {
+        return mPort1;
+    }
+
+    public int port2() {
+        return mPort2;
+    }
+}