Revert of Remove EF_FUNCTION_KEY and EF_NUMPAD_KEY.

ui/events/event_constants.h

Index: ui/events/event_constants.h
diff --git a/ui/events/event_constants.h b/ui/events/event_constants.h
index 05d98b4326aa4a1a9efea51e4273e81a860ae7ca..cf55e3ecd14f0d7a91b6c7a40482116011524941 100644
--- a/ui/events/event_constants.h
+++ b/ui/events/event_constants.h
@@ -100,11 +100,13 @@
 
 // Flags specific to key events
 enum KeyEventFlags {
-  EF_IME_FABRICATED_KEY = 1 << 16,  // Key event fabricated by the underlying
+  EF_NUMPAD_KEY         = 1 << 16,  // Key originates from number pad (Xkb only)
+  EF_IME_FABRICATED_KEY = 1 << 17,  // Key event fabricated by the underlying
                                     // IME without a user action.
                                     // (Linux X11 only)
-  EF_IS_REPEAT          = 1 << 17,
-  EF_FINAL              = 1 << 18,  // Do not remap; the event was created with
+  EF_IS_REPEAT          = 1 << 18,
+  EF_FUNCTION_KEY       = 1 << 19,  // Key originates from function key row
+  EF_FINAL              = 1 << 20,  // Do not remap; the event was created with
                                     // the desired final values.
 };