Add new "Modal form" opcode, also add sample code to use it.

Signed-off-by: ydong10
Reviewed-by: lgao4







git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11764 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/SetupBrowserDxe/IfrParse.c

@@ -2068,6 +2068,14 @@ ParseOpCodes (
       CurrentStatement->RefreshInterval = ((EFI_IFR_REFRESH *) OpCodeData)->RefreshInterval;
       break;
 
+    //
+    // Modal tag
+    //
+    case EFI_IFR_MODAL_TAG_OP:
+      ASSERT (CurrentForm != NULL);
+      CurrentForm->ModalForm = TRUE;
+      break;
+
     //
     // Vendor specific
     //