ash uber tray: Add a tray item for the user.

ash/system/tray/system_tray_delegate.h

Index: ash/system/tray/system_tray_delegate.h
diff --git a/ash/system/tray/system_tray_delegate.h b/ash/system/tray/system_tray_delegate.h
index 795936143d65d4473a6b9730a393406631d38a18..88c547cbaa44fc8d02d63a47de9e59fc8e34558c 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -6,12 +6,19 @@
 #define ASH_SYSTEM_SYSTEM_DELEGATE_H_
 #pragma once
 
+class SkBitmap;
+
 namespace ash {
 
 class SystemTrayDelegate {
  public:
   virtual ~SystemTrayDelegate(){}
 
+  // Gets information about the logged in user.
+  virtual std::string GetUserName() = 0;

[tfarina, 2012/03/01 00:46:23]

nit: could you make these three new methods const?

[sadrul, 2012/03/01 01:35:10]

Done.

+  virtual std::string GetUserEmail() = 0;
+  virtual const SkBitmap& GetUserImage() = 0;
+
   // Shows settings.
   virtual void ShowSettings() = 0;
 
@@ -29,6 +36,15 @@ class SystemTrayDelegate {
 
   // Sets the volume level.
   virtual void SetVolumeLevel(float level) = 0;
+
+  // Attempts to shut down the system.
+  virtual void ShutDown() = 0;
+
+  // Attempts to sign out the user.
+  virtual void SignOut() = 0;
+
+  // Attempts to lock the screen.
+  virtual void LockScreen() = 0;
 };
 
 }  // namespace ash