[Chromoting] Add ability to enable/disable GDrive support per-app in gyp.

remoting/webapp/crd/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 14 matching lines @@
 /**
  * Interval that determines how often the web-app should send a new access token
  * to the host.
  *
  * @const
  * @type {number}
  */
 remoting.ACCESS_TOKEN_RESEND_INTERVAL_MS = 15 * 60 * 1000;
 
 /**
- * True if Cast capability is supported.
- *
- * @type {boolean}
- */
-remoting.enableCast = false;
-
-/**
  * True to enable mouse lock.
  * This is currently disabled because the current client plugin does not
  * properly handle mouse lock and delegated large cursors at the same time.
  * This should be re-enabled (by removing this flag) once a version of
  * the plugin that supports both has reached Chrome Stable channel.
  * (crbug.com/429322).
  *
  * @type {boolean}
  */
 remoting.enableMouseLock = false;
@@ skipping 1618 matching lines @@
     console.error('Received unexpected cast message');
   }
 };
 
 /**
  * Create a CastExtensionHandler and inform the host that cast extension
  * is supported.
  * @private
  */
 remoting.ClientSession.prototype.createCastExtensionHandler_ = function() {
-  if (remoting.enableCast && this.mode_ == remoting.ClientSession.Mode.ME2ME) {
+  var capabilities = remoting.app.getRequiredCapabilities();
+  if (capabilities.indexOf(remoting.ClientSession.Capability.CAST) != -1 &&
+      this.mode_ == remoting.ClientSession.Mode.ME2ME) {
     this.castExtensionHandler_ = new remoting.CastExtensionHandler(this);
   }
 };
 
 /**
  * Returns true if the ClientSession can record video frames to a file.
  * @return {boolean}
  */
 remoting.ClientSession.prototype.canRecordVideo = function() {
   return !!this.videoFrameRecorder_;
@@ skipping 25 matching lines @@
  * @param {Object} message The parsed extension message data.
  * @return {boolean} True if the message was recognized, false otherwise.
  */
 remoting.ClientSession.prototype.handleExtensionMessage =
     function(type, message) {
   if (this.videoFrameRecorder_) {
     return this.videoFrameRecorder_.handleMessage(type, message);
   }
   return false;
 }