[Files.app] Initial implementation of new audio player

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="pp_ifdef('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 94 matching lines @@
     Chrome cannot set wallpaper.
   </message>
 
   <!-- File Manager -->
   <message name="IDS_FLAGS_FILE_MANAGER_SHOW_CHECKBOXES_NAME" desc="Name of the about:flag option to show the selecting checkboxes to the Files app.">
     Show selecting checkboxes
   </message>
   <message name="IDS_FLAGS_FILE_MANAGER_SHOW_CHECKBOXES_DESCRIPTION" desc="Description of the about:flag option to show the selecting checkboxes to the Files app.">
     Show selecting checkboxes in the Files.app.
   </message>
+  <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_AUDIO_PLAYER_NAME" desc="Name of the about:flag option to enable the new audio player app.">
+    Enable the new audio player
+  </message>
+  <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_NEW_AUDIO_PLAYER_DESCRIPTION" desc="Description of the about:flag option to the enable new audio player app.">
+    Use the experimental new audio player instead of the stable one.
+  </message>
   <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_WEBSTORE_INTEGRATION" desc="Name of the about:flag option to enable the webstore integration feature in Files app.">
     Enable the integration of Webstore and Files.app.
   </message>
   <message name="IDS_FLAGS_FILE_MANAGER_ENABLE_WEBSTORE_INTEGRATION_DESCRIPTION" desc="Description of the about:flag option to enable the webstore integration feature in Files app.">
     Enables the webstore integration feature in Files.app.
   </message>
   <message name="IDS_FILE_BROWSER_ARCHIVE_DIRECTORY_LABEL" desc="/archive directory label.">
     Archives
   </message>
   <message name="IDS_FILE_BROWSER_REMOVABLE_DIRECTORY_LABEL" desc="/removable directory label.">
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   <message name="IDS_CHARGER_REPLACEMENT_DIALOG_TITLE" desc="Title of the charger replacement UI dialg">
     Check charger
   </message>
   <message name="IDS_FLAGS_ENABLE_SYSTEM_SOUNDS_NAME" desc="Name of the flag to enable system sounds independently from ChromeVox.">
     Enable system sounds
   </message>
   <message name="IDS_FLAGS_ENABLE_SYSTEM_SOUNDS_DESCRIPTION" desc="Description of the flag to enable system sounds independently from ChromeVox.">
     System sounds will be played independently from ChromeVox.
   </message>
 </grit-part>