Give current TaskView accessibility focus

Send TYPE_VIEW_FOCUSED in the following places:
- When page transition ends on a task
- When finishing state transition to overview
- When un-hiding the current running task view

Bug: 145647019
Change-Id: I7bb357ea60e1dea79daf2ad50efa51071e064da8
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index ae4eae9..71a35e2 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -374,6 +374,8 @@
     protected void onPageEndTransition() {
         mWasInOverscroll = false;
         AccessibilityManagerCompat.sendScrollFinishedEventToTest(getContext());
+        AccessibilityManagerCompat.sendCustomAccessibilityEvent(getPageAt(mCurrentPage),
+                AccessibilityEvent.TYPE_VIEW_FOCUSED, null);
     }
 
     protected int getUnboundedScrollX() {