[Chromoting] Let the webapp detect new clipboard text items when it gets focus.

remoting/webapp/remoting.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 26 matching lines @@
   // Create global objects.
   remoting.oauth2 = new remoting.OAuth2();
   remoting.stats = new remoting.ConnectionStats(
       document.getElementById('statistics'));
   remoting.formatIq = new remoting.FormatIq();
   remoting.hostList = new remoting.HostList(
       document.getElementById('host-list'),
       document.getElementById('host-list-error'));
   remoting.toolbar = new remoting.Toolbar(
       document.getElementById('session-toolbar'));
+  remoting.clipboard = new remoting.Clipboard();
 
   refreshEmail_();
   var email = remoting.oauth2.getCachedEmail();
   if (email) {
     document.getElementById('current-email').innerText = email;
   }
 
+  window.addEventListener('focus', pluginGotFocus_, false);
   window.addEventListener('blur', pluginLostFocus_, false);
+  window.addEventListener('paste', pluginGotPaste_, false);
 
   if (isHostModeSupported_()) {
     var noShare = document.getElementById('chrome-os-no-share');
     noShare.parentNode.removeChild(noShare);
   } else {
     var button = document.getElementById('share-button');
     button.disabled = true;
   }
 
   // Parse URL parameters.
@@ skipping 59 matching lines @@
 /**
  * Sign the user out of Chromoting by clearing the OAuth refresh token.
  */
 remoting.clearOAuth2 = function() {
   remoting.oauth2.clear();
   window.localStorage.removeItem(KEY_EMAIL_);
   remoting.setMode(remoting.AppMode.UNAUTHENTICATED);
 };
 
 /**
+ * Callback function called when the browser window gets focus.
+ */
+function pluginGotFocus_() {
+  /** @type {function(string): void} */
+  document.execCommand;
+  document.execCommand("paste");
+}
+
+/**
+ * Callback function called when the browser window gets a paste operation.
+ *
+ * @param {Event} eventUncast
+ * @return {boolean}
+ */
+function pluginGotPaste_(eventUncast) {
+  var event = /** @type {remoting.ClipboardEvent} */ eventUncast;
+  if (event && event.clipboardData) {
+    remoting.clipboard.toHost(event.clipboardData);
+  }
+  return false;
+}
+
+/**
  * Callback function called when the browser window loses focus. In this case,
  * release all keys to prevent them becoming 'stuck down' on the host.
  */
 function pluginLostFocus_() {
   if (remoting.clientSession && remoting.clientSession.plugin) {
     remoting.clientSession.plugin.releaseAllKeys();
   }
 }
 
 /**
@@ skipping 63 matching lines @@
  */
 function getUrlParameters_() {
   var result = {};
   var parts = window.location.search.substring(1).split('&');
   for (var i = 0; i < parts.length; i++) {
     var pair = parts[i].split('=');
     result[pair[0]] = decodeURIComponent(pair[1]);
   }
   return result;
 }