Set recents view to be visible from alt+tab

Recents was being initialized but was not
marked as attached to app window. This
was causing it's animator to never make it
View.VISIBLE.

Test: Open any app
On physical keyboard press alt+tab
Observe that overview shows up

fixes: 138396234
Change-Id: I9e6c001242f4552027e79b162fb812f476823a37

quickstep/recents_ui_overrides/src/com/android/quickstep/AppToOverviewAnimationProvider.java

@@ -81,6 +81,7 @@ final class AppToOverviewAnimationProvider<T extends BaseDraggingActivity> imple
                 });
         factory.onRemoteAnimationReceived(null);
         factory.createActivityController(RECENTS_LAUNCH_DURATION);
+        factory.setRecentsAttachedToAppWindow(true, false);
         mActivity = activity;
         mRecentsView = mActivity.getOverviewPanel();
         return false;

quickstep/recents_ui_overrides/src/com/android/quickstep/OverviewCommandHelper.java

@@ -99,6 +99,7 @@ public class OverviewCommandHelper {
 
         @Override
         protected void onTransitionComplete() {
+            // TODO(b/138729100) This doesn't execute first time launcher is run
             if (mTriggeredFromAltTab) {
                 RecentsView rv = (RecentsView) mHelper.getVisibleRecentsView();
                 if (rv == null) {