Remoting webapp: Add onError param to HostNativeMessaging.initialize()

remoting/webapp/host_dispatcher.js

 // Copyright 2013 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
  * This class provides an interface between the HostController and either the
  * NativeMessaging Host or the Host NPAPI plugin, depending on whether or not
  * NativeMessaging is supported. Since the test for NativeMessaging support is
  * asynchronous, this class stores any requests on a queue, pending the result
@@ skipping 25 matching lines @@
 
   /** @type {remoting.HostPlugin} @private */
   this.npapiHost_ = null;
 
   /** @type {remoting.HostDispatcher.State} */
   this.state_ = remoting.HostDispatcher.State.UNKNOWN;
 
   /** @type {Array.<function()>} */
   this.pendingRequests_ = [];
 
-  /** @param {boolean} success */
-  var onNativeMessagingInit = function(success) {
-    if (success) {
-      console.log('Native Messaging supported.');
-      that.state_ = remoting.HostDispatcher.State.NATIVE_MESSAGING;
-    } else {
-      console.log('Native Messaging unsupported, falling back to NPAPI.');
-      that.npapiHost_ = createPluginCallback();
-      that.state_ = remoting.HostDispatcher.State.NPAPI;
-    }
-    // Send pending requests.
+  function sendPendingRequests() {
     for (var i = 0; i < that.pendingRequests_.length; i++) {
       that.pendingRequests_[i]();
     }
     that.pendingRequests_ = null;
-  };
+  }
 
-  this.nativeMessagingHost_.initialize(onNativeMessagingInit);
+  function onNativeMessagingInit() {
+    console.log('Native Messaging supported.');
+    that.state_ = remoting.HostDispatcher.State.NATIVE_MESSAGING;
+    sendPendingRequests();
+  }
+
+  function onNativeMessagingFailed(error) {
+    console.log('Native Messaging unsupported, falling back to NPAPI.');
+    that.npapiHost_ = createPluginCallback();
+    that.state_ = remoting.HostDispatcher.State.NPAPI;
+    sendPendingRequests();
+  }
+
+  this.nativeMessagingHost_.initialize(onNativeMessagingInit,
+                                       onNativeMessagingFailed);
 };
 
 /** @enum {number} */
 remoting.HostDispatcher.State = {
   UNKNOWN: 0,
   NATIVE_MESSAGING: 1,
   NPAPI: 2
 };
 
 /**
@@ skipping 350 matching lines @@
       break;
     case remoting.HostDispatcher.State.NPAPI:
       try {
         this.npapiHost_.deletePairedClient(client, onDone);
       } catch (err) {
         onError(remoting.Error.MISSING_PLUGIN);
       }
       break;
   }
 };