Fade out the mouse pointer after inactivity or other events.

Fades out the mouse pointer:
- after 15 seconds of inactivity normally
- after 3 seconds of inactivity in lights out mode
- after a non-modifier key down
- after a touch down

Extended the native Looper to support enqueuing time delayed
messages.  This is used by the PointerController to control
pointer fade timing.

Change-Id: I87792fea7dbe2d9376c78cf354fe3189a484d9da
diff --git a/include/ui/Keyboard.h b/include/ui/Keyboard.h
index 54bc968..609f319 100644
--- a/include/ui/Keyboard.h
+++ b/include/ui/Keyboard.h
@@ -127,6 +127,11 @@
  */
 extern int32_t updateMetaState(int32_t keyCode, bool down, int32_t oldMetaState);
 
+/**
+ * Returns true if a key is a meta key like ALT or CAPS_LOCK.
+ */
+extern bool isMetaKey(int32_t keyCode);
+
 } // namespace android
 
 #endif // _UI_KEYBOARD_H