Disable ctrl+alt+h shortcut after the enrollment started

The moment the enrollment process started, switching to hangouts meet
or back is disallowed, to avoid getting wrong policies. In order to
enroll the device in hangouts for meet, the ctrl+alt+h shortcut should
be pressed after ctrl+alt+e in the enrollment process.

BUG=chromium:1040523
TEST=Manual tests on the device

Change-Id: I4a5f589ab278bf2c6f47c8640d833b02e785735f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014406
Commit-Queue: Igor <igorcov@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Igor <igorcov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738140}

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

@@ -125,4 +125,6 @@ login.createScreen('OAuthEnrollmentScreen', 'oauth-enrollment', function() {
       chrome.send('oauthEnrollAdUnlockConfiguration', [unlock_password]);
     },
   };
+}, {
+  changeRequisitonProhibited: true,
 });

ui/login/display_manager.js

@@ -443,7 +443,7 @@ cr.define('cr.ui.login', function() {
         if (this.isOobeUI())
           this.showDeviceRequisitionPrompt_();
       } else if (name == ACCELERATOR_DEVICE_REQUISITION_REMORA) {
-        if (this.isOobeUI())
+        if (this.isOobeUI() && !attributes.changeRequisitonProhibited)
           this.showDeviceRequisitionRemoraPrompt_(
               'deviceRequisitionRemoraPromptText', 'remora');
       } else if (name == ACCELERATOR_APP_LAUNCH_BAILOUT) {

ui/login/display_manager_types.js

@@ -16,6 +16,7 @@
  *   resetAllowed: (boolean|undefined),
  *   startEnrollmentAllowed: (boolean|undefined),
  *   toggleKioskAllowed: (boolean|undefined),
+ *   changeRequisitonProhibited: (boolean|undefined),
  * }}
  */
 var DisplayManagerScreenAttributes = {};
@@ -62,6 +63,12 @@ DisplayManagerScreenAttributes.startEnrollmentAllowed;
  */
 DisplayManagerScreenAttributes.toggleKioskAllowed;
 
+/**
+ * True if "enroll hangouts meet" accelerator is prohibited.
+ * @type {boolean|undefined}
+ */
+DisplayManagerScreenAttributes.changeRequisitonProhibited;
+
 /**
  * Possible types of UI.
  * @enum {string}

ui/login/screen.js

@@ -144,7 +144,7 @@ cr.define('login', function() {
      * @param {(function()|Object)} proto Prototype of object or function that
      *     returns prototype.
      */
-    createScreen: function(name, id, template) {
+    createScreen: function(name, id, template, attributes) {
       if (typeof template == 'function')
         template = template();
 
@@ -198,7 +198,7 @@ cr.define('login', function() {
           screen.deferredInitialization = function() { screen.initialize(); }
         else
           screen.initialize();
-        Oobe.getInstance().registerScreen(screen);
+        Oobe.getInstance().registerScreen(screen, attributes);
       };
 
       // See also c/b/r/chromeos/login/login_screen_behavior.js