Add timeout for SAML webcam logins

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.js
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
index 4c60e44b4aca827fd883bf3c6446e6444c260618..32acabac73edf36a575cb28e272d71ce8cd7fc2e 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
@@ -27,6 +27,11 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
   // online.
   /** @const */ var IDLE_TIME_CHECK_FREQUENCY = 5 * 1000;
 
+  // Amount of time allowed for video based SAML logins, to prevent a site
+  // from keeping the camera on indefinitely.  This is a hard deadline and
+  // it will not be extended by user activity.
+  /** @const */ var MAX_VIDEO_LOGIN_TIME_SEC = 60;

[achuithb, 2016/05/17 21:49:32]

Just make this in millisec:
var VIDEO_LOGIN_TIMEOUT = 60 * 1000;

[Kevin Cernekee, 2016/05/17 21:56:10]

Done.

+
   /**
    * The modes this screen can be in.
    * @enum {integer}
@@ -82,6 +87,13 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
     loadAnimationGuardTimer_: undefined,
 
     /**
+     * Timer id of the video login timer.
+     * @type {number}
+     * @private
+     */
+    videoTimer_: undefined,
+
+    /**
      * Whether we've processed 'showView' message - either from GAIA or from
      * guard timer.
      * @type {boolean}
@@ -635,6 +647,10 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
      */
     onVideoEnabledChange_: function() {
       this.updateSamlNotice_();
+      if (this.gaiaAuthHost_.videoEnabled && this.videoTimer_ === undefined) {
+        this.videoTimer_ = setTimeout(this.cancel.bind(this),
+            MAX_VIDEO_LOGIN_TIME_SEC * 1000);
+      }
     },
 
     /**
@@ -951,6 +967,11 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
       if (!this.navigation_.refreshVisible && !this.navigation_.closeVisible)
         return;
 
+      if (this.videoTimer_ !== undefined) {
+        clearTimeout(this.videoTimer_);
+        this.videoTimer_ = undefined;
+      }
+
       if (this.closable)
         Oobe.showUserPods();
       else