[remoting android] Generate trimmed-down credits.html.

remoting/credits/credits_js.js

+// Copyright 2015 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.
+
+(function() {
+
+'use strict';
+
+/** @param {Event} event */
+function onClick(event) {
+  var element = /** @type {HTMLElement} */ (event.target);
+  if (element.classList.contains('toggle-licence')) {
+    element.parentElement.parentElement.classList.toggle('selected');
+    document.body.classList.toggle('show-only-selected');
+  }
+}
+
+document.addEventListener('click', onClick, false);
+
+})();