Update native activity & event APIs to follow correct conventions.

Change-Id: Ie64fb3a9c68bc9c117fa5621b75d1f609e304e0e
diff --git a/include/ui/Input.h b/include/ui/Input.h
index 57b292b..8890789 100644
--- a/include/ui/Input.h
+++ b/include/ui/Input.h
@@ -43,7 +43,7 @@
 /*
  * Declare a concrete type for the NDK's input event forward declaration.
  */
-struct input_event_t { };
+struct AInputEvent { };
 
 namespace android {
 
@@ -136,7 +136,7 @@
 /*
  * Input events.
  */
-class InputEvent : public input_event_t {
+class InputEvent : public AInputEvent {
 public:
     virtual ~InputEvent() { }