mash: Migrate ShelfLockingManager to ash/common.

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 9b82c36a60b11eb400ec244ee4b307fc24044209..86ec4ea164a21ae820ce271e111ce6ee05f0ea6c 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -13,6 +13,7 @@
 #include "ash/ash_export.h"
 #include "ash/common/media_delegate.h"
 #include "ash/common/metrics/user_metrics_action.h"
+#include "ash/common/wm/lock_state_observer.h"
 #include "base/observer_list.h"
 
 namespace views {
@@ -225,6 +226,11 @@ class ASH_EXPORT WmShell {
   virtual void AddPointerDownWatcher(views::PointerDownWatcher* watcher) = 0;
   virtual void RemovePointerDownWatcher(views::PointerDownWatcher* watcher) = 0;
 
+  // TODO: Move these back to LockStateController when that has been moved.

[James Cook, 2016/07/20 21:14:30]

nit: TODO(someone) -- the linter barfs on todo formats :-(

[msw, 2016/07/20 21:21:14]

Eh, I'm okay with lint warnings here, unless you object further. Claiming
responsibility for every TODO in this migration project isn't entirely
reasonable; I expect some might hang out longer than we'll hope. Neither of us
have signed up to convert LockStateController, so it doesn't seem obligatory to
stamp my name on this followup task.

[James Cook, 2016/07/20 21:23:24]

Sure, leave it as-is, especially since you have green try runs.

In the future, maybe we should just use TODO(mustash) or something, following
https://google.github.io/styleguide/cppguide.html#TODO_Comments

+  void OnLockStateEvent(LockStateObserver::EventType event);
+  void AddLockStateObserver(LockStateObserver* observer);
+  void RemoveLockStateObserver(LockStateObserver* observer);
+
 #if defined(OS_CHROMEOS)
   LogoutConfirmationController* logout_confirmation_controller() {
     return logout_confirmation_controller_.get();
@@ -282,6 +288,8 @@ class ASH_EXPORT WmShell {
   std::unique_ptr<WindowCycleController> window_cycle_controller_;
   std::unique_ptr<WindowSelectorController> window_selector_controller_;
 
+  base::ObserverList<LockStateObserver> lock_state_observers_;
+
   bool simulate_modal_window_open_for_testing_ = false;
 
 #if defined(OS_CHROMEOS)