Add indication of camera use on 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 95006a488ee692fa416bb72c483a2abb91a6487d..e25a0a2dfd2dcf9e93d1e7a831b21c9eb70a7d58 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
@@ -215,6 +215,8 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
           this.onAuthDomainChange_.bind(this));
       this.gaiaAuthHost_.addEventListener('authFlowChange',
           this.onAuthFlowChange_.bind(this));
+      this.gaiaAuthHost_.addEventListener('videoEnabledChange',
+          this.onVideoEnabledChange_.bind(this));
 
       this.gaiaAuthHost_.addEventListener('loadAbort',
         this.onLoadAbortMessage_.bind(this));
@@ -603,12 +605,34 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
     },
 
     /**
+     * Helper function to update the title bar.
+     */
+    updateSamlNotice_: function() {
+      if (this.gaiaAuthHost_.videoEnabled) {
+        $('saml-notice-message').textContent = loadTimeData.getStringF(
+            'samlNoticeWithVideo',
+            this.gaiaAuthHost_.authDomain);
+        $('saml-notice-recording-indicator').hidden = false;
+        $('saml-notice-container').style.justifyContent = 'left';

[Kevin Cernekee, 2016/05/10 21:05:42]

This part doesn't actually work.  Not sure why.

I also tried setAttribute() but that seems to be used for something else.

[emaxx, 2016/05/13 17:44:03]

There is no "left" value among the allowed values for the "justify-content" CSS
property. Probably the "flex-start" value is the right one.

[Kevin Cernekee, 2016/05/13 18:39:04]

Done.

+      } else {
+        $('saml-notice-message').textContent = loadTimeData.getStringF(
+            'samlNotice',
+            this.gaiaAuthHost_.authDomain);
+      }

[emaxx, 2016/05/13 17:44:03]

Even though the videoEnabled should never change from true to false, hiding the
recording indicator and restoring the notice container styling in this case
should be a bit cleaner.

[Kevin Cernekee, 2016/05/13 18:39:04]

Done.

+    },
+
+    /**
      * Invoked when the authDomain property is changed on the GAIA host.
      */
     onAuthDomainChange_: function() {
-      $('saml-notice-message').textContent = loadTimeData.getStringF(
-          'samlNotice',
-          this.gaiaAuthHost_.authDomain);
+      this.updateSamlNotice_();
+    },
+
+    /**
+     * Invoked when the videoEnabled property is changed on the GAIA host.
+     */
+    onVideoEnabledChange_: function() {
+      this.updateSamlNotice_();
     },
 
     /**