Add new NDK function definitions in input.h

This CL adds 2 new functions to get ActionButton and Classification from
a MotionEvent.

Test: atest android.view.cts.MotionEventTest

Bug: 213266814

Change-Id: Id264a5d110c6c65a7daae89194ab234f64832e13
diff --git a/include/input/Input.h b/include/input/Input.h
index e421dee..2837add 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -275,23 +275,21 @@
 
 /**
  * Classifications of the current gesture, if available.
- *
- * The following values must be kept in sync with MotionEvent.java
  */
 enum class MotionClassification : uint8_t {
     /**
      * No classification is available.
      */
-    NONE = 0,
+    NONE = AMOTION_EVENT_CLASSIFICATION_NONE,
     /**
      * Too early to classify the current gesture. Need more events. Look for changes in the
      * upcoming motion events.
      */
-    AMBIGUOUS_GESTURE = 1,
+    AMBIGUOUS_GESTURE = AMOTION_EVENT_CLASSIFICATION_AMBIGUOUS_GESTURE,
     /**
      * The current gesture likely represents a user intentionally exerting force on the touchscreen.
      */
-    DEEP_PRESS = 2,
+    DEEP_PRESS = AMOTION_EVENT_CLASSIFICATION_DEEP_PRESS,
 };
 
 /**