Added UI to enable debugging features on CrOS

ui/login/display_manager.js

Index: ui/login/display_manager.js
diff --git a/ui/login/display_manager.js b/ui/login/display_manager.js
index 5561b9e2375e257d97432743c5f941ccdbf82f90..577866028e7636282f79bdca4f4616ebf79d272c 100644
--- a/ui/login/display_manager.js
+++ b/ui/login/display_manager.js
@@ -10,6 +10,7 @@
 /** @const */ var SCREEN_OOBE_NETWORK = 'connect';
 /** @const */ var SCREEN_OOBE_HID_DETECTION = 'hid-detection';
 /** @const */ var SCREEN_OOBE_EULA = 'eula';
+/** @const */ var SCREEN_OOBE_ENABLE_DEBUGGING = 'debugging';
 /** @const */ var SCREEN_OOBE_UPDATE = 'update';
 /** @const */ var SCREEN_OOBE_RESET = 'reset';
 /** @const */ var SCREEN_OOBE_ENROLLMENT = 'oauth-enrollment';
@@ -32,6 +33,7 @@
 
 /* Accelerator identifiers. Must be kept in sync with webui_login_view.cc. */
 /** @const */ var ACCELERATOR_CANCEL = 'cancel';
+/** @const */ var ACCELERATOR_ENABLE_DEBBUGING = 'debugging';
 /** @const */ var ACCELERATOR_ENROLLMENT = 'enrollment';
 /** @const */ var ACCELERATOR_KIOSK_ENABLE = 'kiosk_enable';
 /** @const */ var ACCELERATOR_VERSION = 'version';
@@ -131,13 +133,30 @@ cr.define('cr.ui.login', function() {
   ];
 
   /**
+   * Group of screens (screen IDs) where enable debuggingscreen invocation is
+   * available.
+   * @type Array.<string>
+   * @const
+   */
+  var ENABLE_DEBUGGING_AVAILABLE_SCREEN_GROUP = [
+    SCREEN_OOBE_NETWORK,
+    SCREEN_OOBE_EULA,
+    SCREEN_OOBE_UPDATE,
+    SCREEN_ERROR_MESSAGE,

[Nikita (slow), 2014/11/05 17:33:15]

SCREEN_ERROR_MESSAGE may be shown even when there're users on the device i.e.
out-of-box is completed. Are you ok with exposing this functionality outside of
out-of-box flow?

https://code.google.com/p/chromium/issues/detail?id=403165#c13 says
"I think we should start by OOBE-only and then iterate from there."

[zel, 2014/11/11 01:02:28]

Removed.

+    SCREEN_TERMS_OF_SERVICE,
+    SCREEN_WRONG_HWID,
+    SCREEN_FATAL_ERROR
+  ];
+
+  /**
    * Group of screens (screen IDs) that are not participating in
    * left-current-right animation.
    * @type Array.<string>
    * @const
    */
   var NOT_ANIMATED_SCREEN_GROUP = [
-    SCREEN_OOBE_RESET
+    SCREEN_OOBE_ENABLE_DEBUGGING,
+    SCREEN_OOBE_RESET,
   ];
 
 
@@ -331,6 +350,11 @@ cr.define('cr.ui.login', function() {
         if (this.currentScreen.cancel) {
           this.currentScreen.cancel();
         }
+      } else if (name == ACCELERATOR_ENABLE_DEBBUGING) {
+        if (ENABLE_DEBUGGING_AVAILABLE_SCREEN_GROUP.indexOf(
+                currentStepId) != -1) {
+          chrome.send('toggleEnableDebuggingScreen');
+        }
       } else if (name == ACCELERATOR_ENROLLMENT) {
         if (currentStepId == SCREEN_GAIA_SIGNIN ||
             currentStepId == SCREEN_ACCOUNT_PICKER) {