Touch Events capability negotiation

remoting/webapp/base/js/client_session.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.
 
 /**
  * @fileoverview
  * Class handling creation and teardown of a remoting client session.
  *
  * The ClientSession class controls lifetime of the client plugin
  * object and provides the plugin with the functionality it needs to
@@ skipping 208 matching lines @@
   // resolution to the host once connection has been established. See
   // this.plugin_.notifyClientResolution().
   SEND_INITIAL_RESOLUTION: 'sendInitialResolution',
 
   // Let the host know that we're interested in knowing whether or not it
   // rate limits desktop-resize requests.
   // TODO(kelvinp): This has been supported since M-29.  Currently we only have
   // <1000 users on M-29 or below. Remove this and the capability on the host.
   RATE_LIMIT_RESIZE_REQUESTS: 'rateLimitResizeRequests',
 
+  // Indicates native touch input support. If the host does not support
+  // touch then the client will let Chrome synthesize mouse events from touch
+  // input, for compatibility with non-touch-aware systems.
+  TOUCH_EVENTS: 'touchEvents',
+
   // Indicates that host/client supports Google Drive integration, and that the
   // client should send to the host the OAuth tokens to be used by Google Drive
   // on the host.
   GOOGLE_DRIVE: 'googleDrive',
 
   // Indicates that the client supports the video frame-recording extension.
   VIDEO_RECORDER: 'videoRecorder',
 
   // Indicates that the client supports 'cast'ing the video stream to a
   // cast-enabled device.
@@ skipping 283 matching lines @@
   if (newState == remoting.ClientSession.State.CONNECTED) {
     this.connectedDisposables_.add(
         new base.RepeatingTimer(this.reportStatistics.bind(this), 1000));
   } else if (this.isFinished()) {
     base.dispose(this.connectedDisposables_);
     this.connectedDisposables_ = null;
   }
 
   this.notifyStateChanges_(oldState, this.state_);
   this.logToServer_.logClientSessionStateChange(this.state_, this.error_);
+  if (this.plugin_.hasCapability(
+          remoting.ClientSession.Capability.TOUCH_EVENTS)) {
+    this.plugin_.enableTouchEvents(true);
+  }
 };
 
 /**
  * @param {remoting.ClientSession.State} oldState The new state for the session.
  * @param {remoting.ClientSession.State} newState The new state for the session.
  * @private
  */
 remoting.ClientSession.prototype.notifyStateChanges_ =
     function(oldState, newState) {
   /** @type {remoting.Error} */
@@ skipping 79 matching lines @@
  * Enable or disable logging of connection errors due to a host being offline.
  * For example, if attempting a connection using a cached JID, host-offline
  * errors should not be logged because the JID will be refreshed and the
  * connection retried.
  *
  * @param {boolean} enable True to log host-offline errors; false to suppress.
  */
 remoting.ClientSession.prototype.logHostOfflineErrors = function(enable) {
   this.logHostOfflineErrors_ = enable;
 };