Invalidate home task snapshot onWakeAndUnlock.

Also, add ability to pass in null to invalidateHomeTaskSnapshot
if the correct permissions are held, so that System UI does not
need to IPC to Launcher to ask it to invalidate itself.

Fixes: 229191103
Test: atest SystemUITests
Test: wake and unlock, note no double launcher
Change-Id: I0c547639979460b3a85b0ef0a8bbf760d60054cb

1 files changed, 7 insertions, 1 deletions

diff --git a/core/java/android/app/ActivityClient.java b/core/java/android/app/ActivityClient.java
index 7b7b1efdb86b..668dc6b8ec63 100644
--- a/core/java/android/app/ActivityClient.java
+++ b/core/java/android/app/ActivityClient.java
@@ -454,7 +454,13 @@ public class ActivityClient {
         }
     }
 
-    /** Removes the snapshot of home task. */
+    /**
+     * Removes the outdated snapshot of the home task.
+     *
+     * @param homeToken The token of the home task, or null if you have the
+     *                  {@link android.Manifest.permission#MANAGE_ACTIVITY_TASKS} permission and
+     *                  want us to find the home task token for you.
+     */
     public void invalidateHomeTaskSnapshot(IBinder homeToken) {
         try {
             getActivityClientController().invalidateHomeTaskSnapshot(homeToken);