cros: Add message for Chrome notifying WM about signout.

chromeos_wm_ipc_enums.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_WM_IPC_ENUMS_H_
 #define CHROMEOS_WM_IPC_ENUMS_H_
 
 // This file defines enums that are shared between Chrome and the Chrome OS
 // window manager.
 
@@ skipping 242 matching lines @@
   WM_IPC_MESSAGE_CHROME_NOTIFY_SCREEN_REDRAWN_FOR_LOCK = 19,
 
   // Sent from the power manager to the window manager when we're shutting down.
   WM_IPC_MESSAGE_WM_NOTIFY_SHUTTING_DOWN = 20,
 
   // Sent from the power manager to the window manager when we change state
   // as a result of the power button being held down.
   //   param[0]: New state, from WmIpcPowerButtonState enum.
   WM_IPC_MESSAGE_WM_NOTIFY_POWER_BUTTON_STATE = 21,
 
-  // NEXT VALUE TO USE: 22
+  // Sent from Chrome to the window manager when the user is signing out.
+  WM_IPC_MESSAGE_WM_NOTIFY_SIGNING_OUT = 22,
+
+  // NEXT VALUE TO USE: 23
 };
 
 inline const char* WmIpcMessageTypeToString(WmIpcMessageType type) {
   switch (type) {
     case WM_IPC_MESSAGE_UNKNOWN:
       return "UNKNOWN";
     case WM_IPC_MESSAGE_WM_SET_PANEL_STATE:
       return "WM_SET_PANEL_STATE";
     case WM_IPC_MESSAGE_CHROME_NOTIFY_PANEL_STATE:
       return "CHROME_NOTIFY_PANEL_STATE";
@@ skipping 62 matching lines @@
   WM_IPC_POWER_BUTTON_PRE_SHUTDOWN,
 
   // The power button was released before being held long enough to shut
   // down the machine.
   WM_IPC_POWER_BUTTON_ABORTED_SHUTDOWN,
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_WM_IPC_ENUMS_H_