Update bubble bar overflow to have a unique resId

This allows the overflow to be tested properly in end-to-end tests.

Flag: com.android.wm.shell.enable_bubble_bar
Test: atest OverflowBubbleTest (with other CL)
Bug: 347312208
Change-Id: Ice969434f9c40602c4b2d1a5baf6ba0509534a56

quickstep/src/com/android/launcher3/taskbar/bubbles/BubbleBarController.java

@@ -600,7 +600,7 @@ public class BubbleBarController extends IBubblesListener.Stub {
         Bitmap bitmap = createOverflowBitmap(context);
         LayoutInflater inflater = LayoutInflater.from(context);
         BubbleView bubbleView = (BubbleView) inflater.inflate(
-                R.layout.bubblebar_item_view, mBarView, false /* attachToRoot */);
+                R.layout.bubble_bar_overflow_button, mBarView, false /* attachToRoot */);
         BubbleBarOverflow overflow = new BubbleBarOverflow(bubbleView);
         bubbleView.setOverflow(overflow, bitmap);
         return overflow;

res/layout/bubble_bar_overflow_button.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2024 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+<com.android.launcher3.taskbar.bubbles.BubbleView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/bubble_overflow_button"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"/>