[ios Mojo] Integration test for Mojo WebUI.

ios/web/test/data/mojo_test.js

Index: ios/web/test/data/mojo_test.js
diff --git a/ios/web/test/data/mojo_test.js b/ios/web/test/data/mojo_test.js
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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.
+
+// This module provides the test page for WebUIMojoTest. Once the page is
+// loaded it sends "syn" message to the native code. Once page receives "ack"
+// from the native code, the page then sends "fin". Test succeeds only when
+// "fin" is received by the native page. Refer to
+// ios/web/webui/web_ui_mojo_inttest.mm for testing code.
+
+define('main', [
+  'mojo/public/js/bindings',
+  'mojo/public/js/core',
+  'mojo/public/js/connection',
+  'ios/web/test/mojo_test.mojom',
+  'content/public/renderer/service_provider',
+], function(bindings, core, connection, browser, serviceProvider) {
+
+  var page;
+
+  function TestPageImpl(browser) {
+    this.browser_ = browser;
+  };
+
+  TestPageImpl.prototype = Object.create(browser.TestPage.stubClass.prototype);
+
+  /**
+   * Sends message as a string to the native code.
+   *
+   * @param {string} message Message to send.
+   */
+  TestPageImpl.prototype.sendMessage = function(message) {
+    var pipe = core.createMessagePipe();
+    var stub = connection.bindHandleToStub(pipe.handle0, browser.TestPage);
+    bindings.StubBindings(stub).delegate = page;
+    page.stub_ = stub;
+    this.browser_.handleJsMessage(message, pipe.handle1);
+  };
+
+  /**
+   * Called by native code with "ack" message.
+   *
+   * @param {!NativeMessageResultMojo} result Object received from the native
+       code.
+   */
+  TestPageImpl.prototype.handleNativeMessage = function(result) {
+    if (result.message == 'ack') {
+      // Native code has replied with "ack", send "fin" to complete the test.
+      this.sendMessage('fin');
+    }
+  };
+
+  return function() {
+    var browserProxy = connection.bindHandleToProxy(
+        serviceProvider.connectToService(browser.TestUIHandlerMojo.name),
+        browser.TestUIHandlerMojo);
+
+    page = new TestPageImpl(browserProxy);
+
+    // Send "syn" so native code should reply with "ack".
+    page.sendMessage('syn');
+  };
+});