Add dummy theme to avoid breaking the bot

Bug: 930344, 925564
Change-Id: Ib087bcaf222a7c51a2a5a1e5368c873ad1afc21b
Reviewed-on: https://chromium-review.googlesource.com/c/1460111Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Becky Zhou <huayinz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630599}

chrome/android/java/res/values-v17/styles.xml

@@ -208,6 +208,10 @@
         <item name="android:windowLightNavigationBar" tools:targetApi="28">false</item>
     </style>
 
+    <!-- TODO(huayinz): Temporary theme. Remove this. -->
+    <style name="DialogWhenLarge" parent="Base.Theme.Chromium.DialogWhenLarge"
+        tools:ignore="UnusedResources" />
+
     <!-- ThemeOverlay -->
     <style name="OverflowMenuThemeOverlay" parent="Theme.AppCompat.DayNight">
         <item name="android:popupBackground">@null</item>