Track search KeyEvents in SearchDialog.

This fixes the bug preventing switching between global and in-app search,
and also enables long press for voice search (I think).

Bug: 2127442
Change-Id: I045a0f7b2c797c016191709a3983b6b33fc6186e

core/java/android/app/SearchDialog.java

@@ -736,7 +736,8 @@ public class SearchDialog extends Dialog implements OnItemClickListener, OnItemS
             return false;
         }
 
-        if (keyCode == KeyEvent.KEYCODE_SEARCH) {
+        if (keyCode == KeyEvent.KEYCODE_SEARCH && event.getRepeatCount() == 0) {
+            event.startTracking();
             // Consume search key for later use.
             return true;
         }