Add kiosk browser tests for network configuration.

chrome/browser/chromeos/login/app_launch_signin_screen.h

Index: chrome/browser/chromeos/login/app_launch_signin_screen.h
diff --git a/chrome/browser/chromeos/login/app_launch_signin_screen.h b/chrome/browser/chromeos/login/app_launch_signin_screen.h
index b78ad256b99820c31e69b4e4facfee12187838f9..19d0cd9982b10a7cf7be2b7efe1e9d35d0c56669 100644
--- a/chrome/browser/chromeos/login/app_launch_signin_screen.h
+++ b/chrome/browser/chromeos/login/app_launch_signin_screen.h
@@ -42,8 +42,13 @@ class AppLaunchSigninScreen
 
   void Show();
 
+  void set_user_manager_for_testing(UserManager* user_manager) {
+    user_manager_for_testing_ = user_manager;
+  }
+
  private:
   void InitOwnerUserList();
+  UserManager* GetUserManager();
 
   // SigninScreenHandlerDelegate implementation:
   virtual void CancelPasswordChangedFlow() OVERRIDE;
@@ -93,6 +98,8 @@ class AppLaunchSigninScreen
   // This list should have at most one user, and that user should be the owner.
   UserList owner_user_list_;
 
+  UserManager* user_manager_for_testing_;
+
   DISALLOW_COPY_AND_ASSIGN(AppLaunchSigninScreen);
 };