Add haptic feedback constants for rotary-input haptic events.

These haptic patterns should be used when the rotary input on a device
is being used to scroll views. One provides some texture to the scroll
(e.g. light taps every few degrees), one provides a slightly heavier tap
when passing an element in, say, a recyclerview, and the last provides a
"thud" when getting to the end of a list.

All hidden for now; this is mostly to reserve the constants that are
being used by Wear. We can then expose these in a Compat library in the
future.

Test: Only new constants, no new functionality.
Change-Id: Ic85c21d4cb79184c2e5aa4a9f12d91a13db14e85

core/java/android/view/HapticFeedbackConstants.java

@@ -121,6 +121,29 @@ public class HapticFeedbackConstants {
      */
     public static final int REJECT = 17;
 
+    /**
+     * A haptic effect to provide texture while a rotary input device is being scrolled.
+     *
+     * @hide
+     */
+    public static final int ROTARY_SCROLL_TICK = 18;
+
+    /**
+     * A haptic effect to signal that a list element has been focused while scrolling using a rotary
+     * input device.
+     *
+     * @hide
+     */
+    public static final int ROTARY_SCROLL_ITEM_FOCUS = 19;
+
+    /**
+     * A haptic effect to signal reaching the scrolling limits of a list while scrolling using a
+     * rotary input device.
+     *
+     * @hide
+     */
+    public static final int ROTARY_SCROLL_LIMIT = 20;
+
     /**
      * The phone has booted with safe mode enabled.
      * This is a private constant.  Feel free to renumber as desired.