Add WindowManagerPolicy.allowKeyRepeat() method for disabling key repeats.

Part of a fix for bug b/2198537

Change-Id: I99dc64772fa7644b12432d5549603025196ea3e2
Signed-off-by: Mike Lockwood <lockwood@android.com>

core/java/android/view/WindowManagerPolicy.java

@@ -868,4 +868,9 @@ public interface WindowManagerPolicy {
      * requesting this is no longer visible.
      */
     public void screenOnStoppedLw();
+
+    /**
+     * Return false to disable key repeat events from being generated.
+     */
+    public boolean allowKeyRepeat();
 }