Add window states docked; and docked minimized. Add wm window event to set docked and undocked.

ash/wm/lock_window_state.cc

Index: ash/wm/lock_window_state.cc
diff --git a/ash/wm/lock_window_state.cc b/ash/wm/lock_window_state.cc
index fa1684fda80da50a3bb62cd5f6a207ad98cb0b65..d58afad055da4720b93b6308d4c75a1e50e0edad 100644
--- a/ash/wm/lock_window_state.cc
+++ b/ash/wm/lock_window_state.cc
@@ -50,6 +50,8 @@ void LockWindowState::OnWMEvent(wm::WindowState* window_state,
     case wm::WM_EVENT_SNAP_RIGHT:
     case wm::WM_EVENT_NORMAL:
     case wm::WM_EVENT_MAXIMIZE:
+    case wm::WM_EVENT_DOCK:
+    case wm::WM_EVENT_UNDOCK:
       UpdateWindow(window_state,
                    GetMaximizedOrCenteredWindowType(window_state));
       return;