Add CreatePopUp API into UefiLib

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8016 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Library/UefiLib.h

@@ -716,6 +716,31 @@ GetBestLanguage (
   ...
   );
 
+/**
+  Draws a dialog box to the console output device specified by 
+  ConOut defined in the EFI_SYSTEM_TABLE and waits for a keystroke
+  from the console input device specified by ConIn defined in the 
+  EFI_SYSTEM_TABLE.
+
+  If there are no strings in the variable argument list, then ASSERT().
+  If all the strings in the variable argument list are empty, then ASSERT().
+
+  @param[in]   Attribute  Specifies the foreground and background color of the popup.
+  @param[out]  Key        A pointer to the EFI_KEY value of the key that was 
+                          pressed.  This is an optional parameter that may be NULL.
+                          If it is NULL then no wait for a keypress will be performed.
+  @param[in]  ...         The variable argument list that contains pointers to Null-
+                          terminated Unicode strings to display in the dialog box.  
+                          The variable argument list is terminated by a NULL.
+
+**/
+VOID
+EFIAPI
+CreatePopUp (
+  IN  UINTN          Attribute,                
+  OUT EFI_INPUT_KEY  *Key,      OPTIONAL
+  ...
+  );
 
 /**
   Retrieves the width of a Unicode character.