[ARC] Add "(beta)" string to Play Store until we decide to take it off.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 6187 matching lines @@
   </message>
   <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_NAME" desc="Name of the flag used to enable launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
     Chrome Web Store Gallery app for printer drivers
   </message>
   <message name="IDS_FLAGS_PRINTER_PROVIDER_SEARCH_APP_DESCRIPTION" desc="Description of a flag in chrome://flags that enables launching Chrome Web Store Gallery widget app for searching for printer provider apps.">
     Enables Chrome Web Store Gallery app for printer drivers. The app searches Chrome Web Store for extensions that support printing to a USB printer with specific USB ID.
   </message>
 
   <!-- Android Apps -->
   <message name="IDS_OPTIONS_ARC_TITLE" desc="The title of Google Play Store section.">
-    Google Play Store
+    Google Play Store (beta)
+  </message>
+  <message name="IDS_ARC_PLAYSTORE_ICON_TITLE_BETA" desc="The Play Store icon title with the beta label in the launcher.">
+    Play Store (beta)
   </message>
   <message name="IDS_OPTIONS_ARC_ENABLE" desc="Label for the checkbox that enables Google Play Store apps.">
     Enable Google Play Store on your Chromebook.
   </message>
   <message name="IDS_OPTIONS_ARC_MANAGE_APPS" desc="Label for launching  Android apps settings.">
     Manage your Android <ph name="BEGIN_LINK">&lt;a is="action-link" id="android-apps-settings-link" role="link"&gt;</ph>preferences<ph name="END_LINK">&lt;/a&gt;</ph>.
   </message>
   <message name="IDS_ARC_NOTIFICATION_TITLE" desc="Title of the first-run notification that enables Android apps.">
     Google Play Store
   </message>
@@ skipping 130 matching lines @@
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_NAME" desc="Name of the about: flag for enabling emoji, handwriting and voice input on opt-in IME menu.">
     Emoji, handwriting and voice input on opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_EHV_INPUT_DESCRIPTION" desc="Description of the about: flag enabling emoji, handwriting and voice input on opt-in IME menu.">
     Enable access to emoji, handwriting and voice input form opt-in IME menu.
   </message>
   <message name="IDS_HATS_DONE_BUTTON_LABEL" desc="Label used for the done button at the end of survey">
     Done
   </message>
 </grit-part>