Native api to get OAuth2 access tokens in Print Preview Web UI.

chrome/browser/resources/print_preview/native_layer.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * An interface to the native Chromium printing system layer.
    * @constructor
@@ skipping 21 matching lines @@
         this.onInvalidPrinterSettings_.bind(this);
     global['onDidGetDefaultPageLayout'] =
         this.onDidGetDefaultPageLayout_.bind(this);
     global['onDidGetPreviewPageCount'] =
         this.onDidGetPreviewPageCount_.bind(this);
     global['reloadPreviewPages'] = this.onReloadPreviewPages_.bind(this);
     global['onDidPreviewPage'] = this.onDidPreviewPage_.bind(this);
     global['updatePrintPreview'] = this.onUpdatePrintPreview_.bind(this);
     global['printScalingDisabledForSourcePDF'] =
         this.onPrintScalingDisabledForSourcePDF_.bind(this);
+    global['onDidGetAccessToken'] = this.onDidGetAccessToken_.bind(this);
   };
 
   /**
    * Event types dispatched from the Chromium native layer.
    * @enum {string}
    * @const
    */
   NativeLayer.EventType = {
+    ACCESS_TOKEN_READY: 'print_preview.NativeLayer.ACCESS_TOKEN_READY',
     CAPABILITIES_SET: 'print_preview.NativeLayer.CAPABILITIES_SET',
     CLOUD_PRINT_ENABLE: 'print_preview.NativeLayer.CLOUD_PRINT_ENABLE',
     DESTINATIONS_RELOAD: 'print_preview.NativeLayer.DESTINATIONS_RELOAD',
     DISABLE_SCALING: 'print_preview.NativeLayer.DISABLE_SCALING',
     FILE_SELECTION_CANCEL: 'print_preview.NativeLayer.FILE_SELECTION_CANCEL',
     FILE_SELECTION_COMPLETE:
         'print_preview.NativeLayer.FILE_SELECTION_COMPLETE',
     GET_CAPABILITIES_FAIL: 'print_preview.NativeLayer.GET_CAPABILITIES_FAIL',
     INITIAL_SETTINGS_SET: 'print_preview.NativeLayer.INITIAL_SETTINGS_SET',
     LOCAL_DESTINATIONS_SET: 'print_preview.NativeLayer.LOCAL_DESTINATIONS_SET',
@@ skipping 33 matching lines @@
    * Version of the serialized state of the print preview.
    * @type {number}
    * @const
    * @private
    */
   NativeLayer.SERIALIZED_STATE_VERSION_ = 1;
 
   NativeLayer.prototype = {
     __proto__: cr.EventTarget.prototype,
 
+    /**
+     * Requests access token for cloud print requests.
+     * @param {string} authType type of access token.
+     */
+    startGetAccessToken: function(authType) {
+      chrome.send('getAccessToken', [authType]);
+    },
+
     /** Gets the initial settings to initialize the print preview with. */
     startGetInitialSettings: function() {
       chrome.send('getInitialSettings');
     },
 
     /**
      * Requests the system's local print destinations. A LOCAL_DESTINATIONS_SET
      * event will be dispatched in response.
      */
     startGetLocalDestinations: function() {
@@ skipping 400 matching lines @@
     onDidPreviewPage_: function(pageNumber, previewUid, previewResponseId) {
       var pagePreviewGenEvent = new cr.Event(
           NativeLayer.EventType.PAGE_PREVIEW_READY);
       pagePreviewGenEvent.pageIndex = pageNumber;
       pagePreviewGenEvent.previewUid = previewUid;
       pagePreviewGenEvent.previewResponseId = previewResponseId;
       this.dispatchEvent(pagePreviewGenEvent);
     },
 
     /**
+     * Notification that access token is ready.
+     * @param {string} authType Type of access token.
+     * @param {string} accessToken Access token.
+     * @private
+     */
+    onDidGetAccessToken_: function(authType, accessToken) {
+      var getAccessTokenEvent = new cr.Event(
+          NativeLayer.EventType.ACCESS_TOKEN_READY);
+      getAccessTokenEvent.authType = authType;
+      getAccessTokenEvent.accessToken = accessToken;
+      this.dispatchEvent(getAccessTokenEvent);
+    },
+
+    /**
      * Update the print preview when new preview data is available.
      * Create the PDF plugin as needed.
      * Called from PrintPreviewUI::PreviewDataIsAvailable().
      * @param {number} previewUid Preview unique identifier.
      * @param {number} previewResponseId The preview request id that resulted in
      *     this response.
      * @private
      */
     onUpdatePrintPreview_: function(previewUid, previewResponseId) {
       var previewGenDoneEvent = new cr.Event(
@@ skipping 175 matching lines @@
       return this.serializedAppStateStr_;
     }
   };
 
   // Export
   return {
     NativeInitialSettings: NativeInitialSettings,
     NativeLayer: NativeLayer
   };
 });