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 1dd44bbccdec2dcf85c91c0ed4c103dfa5a8986c..0c00325cdfc770c52c22b5a328b7d9bacbe77aef 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -6,12 +6,19 @@
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #pragma once
 
+class SkBitmap;
+
 namespace ash {
 
 class SystemTrayDelegate {
  public:
   virtual ~SystemTrayDelegate() {}
 
+  // Gets information about the logged in user.
+  virtual const std::string GetUserDisplayName() = 0;
+  virtual const 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