Make StatusBar focusable when there is an expanded bubble.

Bug: 123544535
Test: atest BubbleControllerTest
Change-Id: I92e5c68bc9fe2033458bfe4769f8c6d3244d6f53
diff --git a/packages/SystemUI/src/com/android/systemui/bubbles/BubbleController.java b/packages/SystemUI/src/com/android/systemui/bubbles/BubbleController.java
index 404f2e5..9a9a52f 100644
--- a/packages/SystemUI/src/com/android/systemui/bubbles/BubbleController.java
+++ b/packages/SystemUI/src/com/android/systemui/bubbles/BubbleController.java
@@ -186,7 +186,12 @@
      * Set a listener to be notified of bubble expand events.
      */
     public void setExpandListener(BubbleExpandListener listener) {
-        mExpandListener = listener;
+        mExpandListener = ((isExpanding, key) -> {
+            if (listener != null) {
+                listener.onBubbleExpandChanged(isExpanding, key);
+            }
+            mStatusBarWindowController.setBubbleExpanded(isExpanding);
+        });
         if (mStackView != null) {
             mStackView.setExpandListener(mExpandListener);
         }