Make contained home bridge receive scopes to get auth token.

Bug: 927809
Change-Id: I8d0aa79c00699f95f7e79cd673a92f39529b7d04
Reviewed-on: https://chromium-review.googlesource.com/c/1474047Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Bruno Santos <brunoad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633704}

chrome/browser/resources/chromeos/contained_home/api.js

@@ -25,10 +25,12 @@ containedHome.Bridge = class {
   addListener(listener) {}
 
   /**
-   * Returns an access token with scope for the contained home experience.
+   * Returns an access token with the requested scopes.
+   * @param {!Array<string>} scopes List of scopes to use when obtaining access
+   *     token.
    * @return {!Promise<string>} Promise for the access token.
    */
-  getAccessToken() {}
+  getAccessToken(scopes) {}
 
   /**
    * Returns a list of apps installed in the user session.

chrome/browser/resources/chromeos/contained_home/api_impl.js

@@ -33,9 +33,9 @@ class ContainedHomeBridge {
   }
 
   /** @override */
-  getAccessToken() {
+  getAccessToken(scopes) {
     return new Promise((resolve, reject) => {
-      chrome.identity.getAuthToken({'scopes': []}, token => {
+      chrome.identity.getAuthToken({'scopes': scopes}, token => {
         if (token) {
           resolve(token);
         } else {