In overflow view, set bubble name TextView width to a fixed value

Bug: 198539434
Test: Manual, verified that bubbles in the overflow view are evenly spaced
Test: screeshot before the fix: https://screenshot.googleplex.com/6RRa6qoTbFrJfCC.png
Test: screeshot after the fix: https://screenshot.googleplex.com/BmdPN6AvXedYFNE.png
Change-Id: Icba048b65591e186d579a2c56685499fea316e9f

libs/WindowManager/Shell/res/layout/bubble_overflow_view.xml

@@ -32,7 +32,7 @@
         android:id="@+id/bubble_view_name"
         android:textAppearance="@*android:style/TextAppearance.DeviceDefault.ListItem"
         android:textSize="13sp"
-        android:layout_width="wrap_content"
+        android:layout_width="@dimen/bubble_name_width"
         android:layout_height="wrap_content"
         android:maxLines="1"
         android:lines="2"

libs/WindowManager/Shell/res/values/dimen.xml

@@ -115,6 +115,8 @@
     <dimen name="bubble_spacing">3dp</dimen>
     <!-- Size of the bubble. -->
     <dimen name="bubble_size">60dp</dimen>
+    <!-- Width of bubble name view -->
+    <dimen name="bubble_name_width">90dp</dimen>
     <!-- Size of the badge shown on the bubble. -->
     <dimen name="bubble_badge_size">24dp</dimen>
     <!-- Extra padding added to the touchable rect for bubbles so they are easier to grab. -->