Support haptic feedback for virtual keys defined in key layout.

Change-Id: I83e4108a87332692e03791dc066206becbc7941f
diff --git a/include/ui/KeycodeLabels.h b/include/ui/KeycodeLabels.h
index c8d6ffc..f71d9cd 100755
--- a/include/ui/KeycodeLabels.h
+++ b/include/ui/KeycodeLabels.h
@@ -142,6 +142,7 @@
     { NULL, 0 }
 };
 
+// See also policy flags in Input.h.
 static const KeycodeLabel FLAGS[] = {
     { "WAKE", 0x00000001 },
     { "WAKE_DROPPED", 0x00000002 },
@@ -151,6 +152,7 @@
     { "ALT_GR", 0x00000020 },
     { "MENU", 0x00000040 },
     { "LAUNCHER", 0x00000080 },
+    { "VIRTUAL", 0x00000100 },
     { NULL, 0 }
 };