Add RESERVE_NEW_UI_EVENT_ID field to EventEnum interface.

Bug: 193797130
Test: atest SystemUITests
Change-Id: I806e1a5f60f49254aa7ea23bef31b3517c0de1fd

core/java/com/android/internal/logging/UiEventLogger.java

@@ -32,6 +32,22 @@ public interface UiEventLogger {
      * OEMs should use event IDs above 100000 and below 1000000 (1 million).
      */
     interface UiEventEnum {
+
+        /**
+         * Tag used to request new UI Event IDs via presubmit analysis.
+         *
+         * <p>Use RESERVE_NEW_UI_EVENT_ID as the constructor parameter for a new {@link EventEnum}
+         * to signal the presubmit analyzer to reserve a new ID for the event. The new ID will be
+         * returned as a Gerrit presubmit finding.  Do not submit {@code RESERVE_NEW_UI_EVENT_ID} as
+         * the constructor parameter for any event.
+         *
+         * <pre>
+         * &#064;UiEvent(doc = "Briefly describe the interaction when this event will be logged")
+         * UNIQUE_EVENT_NAME(RESERVE_NEW_UI_EVENT_ID);
+         * </pre>
+         */
+        int RESERVE_NEW_UI_EVENT_ID = Integer.MIN_VALUE; // Negative IDs are ignored by the logger.
+
         int getId();
     }