Add LockLayoutManager responsible for lock container (login/lock).

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 2a6597d13022caae5cb3fba51f059f95dc0d3ddc..982cae47873e1705228507fb9d9d9dc3982e186b 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -123,14 +123,19 @@ keyboard::KeyboardControllerProxy*
 }
 
 void TestShellDelegate::VirtualKeyboardActivated(bool activated) {
+  FOR_EACH_OBSERVER(ash::VirtualKeyboardStateObserver,
+                    keyboard_state_observer_list_,
+                    OnVirtualKeyboardStateChanged(activated));
 }
 
 void TestShellDelegate::AddVirtualKeyboardStateObserver(
     VirtualKeyboardStateObserver* observer) {
+  keyboard_state_observer_list_.AddObserver(observer);
 }
 
 void TestShellDelegate::RemoveVirtualKeyboardStateObserver(
     VirtualKeyboardStateObserver* observer) {
+  keyboard_state_observer_list_.RemoveObserver(observer);
 }
 
 content::BrowserContext* TestShellDelegate::GetActiveBrowserContext() {