[ChromeOS] Expose keyboard remapping to signin screen.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index b978a550350be9680459582ca4fa85cefd58c361..2f3a934e0d8a1c18494d84a84002ae840575d834 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -270,6 +270,10 @@ class SigninScreenHandler
   // show instantaneously in tests.
   void ZeroOfflineTimeoutForTesting();
 
+  const AccountId& focused_pod_account_id() {

[xiyuan, 2017/02/22 17:40:18]

nit: Make it a const method
i.e.
  const AccountId& focused_pod_account_id() const {

[xdai1, 2017/02/22 18:36:16]

Removed this function according to alemate@'s suggestion.

+    return *focused_pod_account_id_.get();

[xiyuan, 2017/02/22 17:40:18]

What if |focused_pod_account_id_| holds nullptr and does not own anything?

+  }
+
  private:
   enum UIState {
     UI_STATE_UNKNOWN = 0,