For #7157 - Set BrowserMenu width to be max 314 dp (#9731)

Instead of having a fixed width of 250dp the BrowserMenu will now have a
dynamic width between 250dp and 314dp allowing for a better fit for the menu
items it could display.

app/src/main/res/values/dimens.xml

@@ -2,11 +2,13 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
     <dimen name="crash_reporter_close_tab_button_horizontal_margin">26dp</dimen>
     <dimen name="crash_reporter_close_tab_button_bottom_margin">24dp</dimen>
     <dimen name="glyph_button_height">48dp</dimen>
     <dimen name="glyph_button_width">48dp</dimen>
+    <dimen name="mozac_browser_menu_width_min" tools:ignore="UnusedResources">250dp</dimen>
+    <dimen name="mozac_browser_menu_width_max" tools:ignore="UnusedResources">314dp</dimen>
     <dimen name="mozac_browser_menu_corner_radius">8dp</dimen>
     <dimen name="toolbar_elevation">7dp</dimen>
     <dimen name="library_item_height">56dp</dimen>