Don't show starting window for overlay activities

Since they are just overlaying other activities in the task.

Change-Id: I5d9b8e22c9858e282fc36ed4c3f7aff9f9b7654d
Fixes: 37199644
Test: manual
diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index 7cdddc0..fe03c36 100644
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -2130,6 +2130,11 @@
         if (mWindowContainerController == null) {
             return;
         }
+        if (mTaskOverlay) {
+            // We don't show starting window for overlay activities.
+            return;
+        }
+
         final CompatibilityInfo compatInfo =
                 service.compatibilityInfoForPackageLocked(info.applicationInfo);
         final boolean shown = mWindowContainerController.addStartingWindow(packageName, theme,