chromeos: Move SystemTrayDelegate::RequestShutdown to WmShell

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 9429268277fab9197d8e4133b99ae529bd6468a9..da548cf30f7e2251a1f53703d71670a1f14ea479 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -398,6 +398,12 @@ class ASH_EXPORT WmShell {
   void AddLockStateObserver(LockStateObserver* observer);
   void RemoveLockStateObserver(LockStateObserver* observer);
 
+  // Displays the shutdown animation and requests a system shutdown or system
+  // restart depending on the the state of the |RebootOnShutdown| device policy.
+  // TODO(mash): Remove this method and call LockStateController directly when

[Daniel Erat, 2016/11/10 19:24:53]

just double-checked that there don't appear to be any committers with this
username :-)

as an aside, i wouldn't mind if you felt like giving LockStateController a
better name while you're working on it. it deals with both locking and shutting
down. the thing that does animations for it is called SessionStateAnimator, but
SessionStateController may be confusing since we also have SessionStateDelegate
and SessionStateObserver in ash/common/session.

+  // it is available to code in ash/common.
+  virtual void RequestShutdown() = 0;
+
   void SetShelfDelegateForTesting(std::unique_ptr<ShelfDelegate> test_delegate);
   void SetPaletteDelegateForTesting(
       std::unique_ptr<PaletteDelegate> palette_delegate);