Add indication of camera use on SAML webcam logins

chrome/browser/resources/gaia_auth_host/saml_handler.js

 // Copyright 2015 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.
 
 <include src="post_message_channel.js">
 
 /**
  * @fileoverview Saml support for webview based auth.
  */
 
@@ skipping 130 matching lines @@
      */
     this.blockInsecureContent = false;
 
     this.webview_.addEventListener(
         'contentload', this.onContentLoad_.bind(this));
     this.webview_.addEventListener(
         'loadabort', this.onLoadAbort_.bind(this));
     this.webview_.addEventListener(
         'loadcommit', this.onLoadCommit_.bind(this));
     this.webview_.addEventListener(
-        'permissionrequest', function(e) {
-          if (e.permission === 'media') {
-            // The actual permission check happens in
-            // WebUILoginView::RequestMediaAccessPermission().
-            e.request.allow();
-          }
-        });
+        'permissionrequest', this.onPermissionRequest_.bind(this));
 
     this.webview_.request.onBeforeRequest.addListener(
         this.onInsecureRequest.bind(this),
         {urls: ['http://*/*', 'file://*/*', 'ftp://*/*']},
         ['blocking']);
     this.webview_.request.onHeadersReceived.addListener(
         this.onHeadersReceived_.bind(this),
         {urls: ['<all_urls>'], types: ['main_frame', 'xmlhttprequest']},
         ['blocking', 'responseHeaders']);
 
@@ skipping 284 matching lines @@
 
     onPageLoaded_: function(channel, msg) {
       this.authDomain = extractDomain(msg.url);
       this.dispatchEvent(new CustomEvent(
           'authPageLoaded',
           {detail: {url: url,
                     isSAMLPage: this.isSamlPage_,
                     domain: this.authDomain}}));
     },
 
+    onPermissionRequest_: function(permissionEvent) {
+      if (permissionEvent.permission === 'media') {
+        // The actual permission check happens in
+        // WebUILoginView::RequestMediaAccessPermission().
+        this.dispatchEvent(new CustomEvent('videoEnabled'));
+        permissionEvent.request.allow();
+      }
+    },
+
     onGetSAMLFlag_: function(channel, msg) {
       return this.isSamlPage_;
     },
   };
 
   return {
     SamlHandler: SamlHandler
   };
 });