Adding new user menu section to the SystemTrayMenu & refactoring of user access

ash/ash_strings.grd

Index: ash/ash_strings.grd
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index 4d850cfb7e745a377f444f0ebc68ca574db36f2c..ebcd0f5e07949915f0ef2c9d0e3a0727645e837c 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -215,6 +215,9 @@ Press Ctrl+Alt+Z to disable.
       <message name="IDS_ASH_STATUS_TRAY_SIGN_OUT" desc="The label used for the button in the status tray to sign out of the system.">
         Sign out
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_SIGN_OUT_ALL" desc="The label used for the button in the status tray to sign out all users of the system.">
+        Sign out all
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_GUEST_LABEL" desc="The label used in the system tray's user card to indicate that the current session is a guest session.">
         Guest
       </message>
@@ -245,6 +248,15 @@ Press Ctrl+Alt+Z to disable.
       <message name="IDS_ASH_STATUS_TRAY_SMS_NUMBER" desc="Sender for SMS messagees in the system tray.">
         SMS from <ph name="PHONE_NUMBER">$1<ex>08700 776655</ex></ph>
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_SIGN_IN_ANOTHER_ACCOUNT" desc="The string for the button which lets the user add another account to the current session.">
+        Sign in another account...
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAPTION_CANNOT_ADD_USER" desc="The caption for the error message when the user has reached the limit of multi profile users.">
+        Can't sign into another account.
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_MESSAGE_CANNOT_ADD_USER" desc="The error message when the user has reached the limit of multi profile users.">
+        You can only have up to three accounts in multiple sign-in.
+      </message>
 
       <message name="IDS_ASH_STATUS_TRAY_BLUETOOTH" desc="The label used as the header in the bluetooth popup.">
         Bluetooth