chromium/chrome/test/data/extensions/platform_apps/web_view/common/console_messages/guest.js

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// A guest that logs console messages.
// Note that the embedder has to initiate a postMessage first so that
// the guest has a reference to the embedder's window.
window.console.log('Guest script loading.');

// The window reference of the embedder to send post message reply.
var embedderWindowChannel = null;

// A value that uniquely identifies the guest sending the messages to the
// embedder.
var channelId = 0;
var notifyEmbedder = function(msg_array) {
  var msg = msg_array.concat([channelId]);
  embedderWindowChannel.postMessage(JSON.stringify(msg), '*');
};

var onPostMessageReceived = function(e) {
  embedderWindowChannel = e.source;
  var data = JSON.parse(e.data);
  if (data[0] == 'create-channel') {
    window.console.log('aaa. guest: create-channel');
    channelId = data[1];
    notifyEmbedder(['channel-created']);
    return;
  }

  // Tests.
  // These logs trigger event listeners in the embedder.
  switch (data[0]) {
    case 'test-1a':
      window.console.log('log-one-a');  // LOG_INFO = 0.
      break;
    case 'test-1b':
      window.console.info('log-one-b');  // LOG_INFO = 0.
      break;
    case 'test-2':
      window.console.warn('log-two');  // LOG_WARNING = 1.
      break;
    case 'test-3':
      window.console.error('log-three');  // LOG_ERROR = 2.
      break;
    case 'test-4':
      window.console.debug('log-four');  // LOG_VERBOSE = -1.
      break;
    case 'test-throw':
      throw Error('log-five');
      break;
  }
};

window.addEventListener('message', onPostMessageReceived, false);