cros: Make sure views-based lock screen is destroyed after it is dismissed.

ash/login/mock_lock_screen_client.h

Index: ash/login/mock_lock_screen_client.h
diff --git a/ash/login/mock_lock_screen_client.h b/ash/login/mock_lock_screen_client.h
index 52874b3530e3c4feff543d5ac897d8c0ee41b644..5700d5205cbe20d1ce206ae9a854f4f8e45c5706 100644
--- a/ash/login/mock_lock_screen_client.h
+++ b/ash/login/mock_lock_screen_client.h
@@ -18,11 +18,19 @@ class MockLockScreenClient : public mojom::LockScreenClient {
 
   mojom::LockScreenClientPtr CreateInterfacePtrAndBind();
 
+  // Result that should be passed to |callback| in |AuthenticateUser|.
+  bool authenticate_user_callback_result = true;

[xiyuan, 2017/06/06 22:37:51]

move this to private and add a setter instead.

[jdufault, 2017/06/07 18:58:35]

Done.

+
   // mojom::LockScreenClient:
-  MOCK_METHOD3(AuthenticateUser,
+  void AuthenticateUser(const AccountId& account_id,
+                        const std::string& password,
+                        bool authenticated_by_pin,
+                        AuthenticateUserCallback callback) override;
+  MOCK_METHOD4(AuthenticateUser_,
                void(const AccountId& account_id,
                     const std::string& password,
-                    bool authenticated_by_pin));
+                    bool authenticated_by_pin,
+                    AuthenticateUserCallback& callback));
 
  private:
   mojo::Binding<ash::mojom::LockScreenClient> binding_;