Dump controller for AppWindowToken

To help with debugging.

Bug: 36097078
Test: N/A
Change-Id: I72108b918d839b67efe8b8eed65a33775bd94dbc
diff --git a/services/core/java/com/android/server/wm/AppWindowContainerController.java b/services/core/java/com/android/server/wm/AppWindowContainerController.java
index e26914e..c03c487 100644
--- a/services/core/java/com/android/server/wm/AppWindowContainerController.java
+++ b/services/core/java/com/android/server/wm/AppWindowContainerController.java
@@ -712,6 +712,10 @@
 
     @Override
     public String toString() {
-        return "{AppWindowContainerController token=" + mToken + "}";
+        return "AppWindowContainerController{"
+                + " token=" + mToken
+                + " mContainer=" + mContainer
+                + " mListener=" + mListener
+                + "}";
     }
 }