Show instant app notifier for non-fullscreen activity

On the original Android, an instant app notifier shows only for
fullscreen and split-screen-secondary windowing modes.

This CL adds freeform windowing mode for ARC.

(manually cherry picked from commit
18aa4446bc049ae6592828f5f646ad421958208f in vendor/google_arc)

Bug: 127858333
Bug: 128961725
Bug: 123917211
Bug: 128877314
Test: manual (run an instant app and confirm a notification)
Change-Id: I3fdc8e5ccfae479082dc3fa287e0b77cbc1ecc4a
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/InstantAppNotifier.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/InstantAppNotifier.java
index f284f73..53fbe5b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/InstantAppNotifier.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/InstantAppNotifier.java
@@ -17,6 +17,7 @@
 package com.android.systemui.statusbar.notification;
 
 import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
+import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
 import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
 import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_SECONDARY;
@@ -155,7 +156,8 @@
                                     focusedStack.configuration.windowConfiguration
                                             .getWindowingMode();
                             if (windowingMode == WINDOWING_MODE_FULLSCREEN
-                                    || windowingMode == WINDOWING_MODE_SPLIT_SCREEN_SECONDARY) {
+                                    || windowingMode == WINDOWING_MODE_SPLIT_SCREEN_SECONDARY
+                                    || windowingMode == WINDOWING_MODE_FREEFORM) {
                                 checkAndPostForStack(focusedStack, notifs, noMan, pm);
                             }
                         }