Show UI when a folder is empty.

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>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 193 matching lines @@
   </message>
   <message name="IDS_FILE_BROWSER_ERROR_HIDDEN_NAME" desc="Error message displayed when the user tries to rename to or create a file started with dot.">
     Names starting with dot are reserved for the system. Please choose another name.
   </message>
   <message name="IDS_FILE_BROWSER_ERROR_WHITESPACE_NAME" desc="Error message displayed when the user enters a file name consisting of only whitespace characters.">
     Invalid name
   </message>
   <message name="IDS_FILE_BROWSER_ERROR_LONG_NAME" desc="Error message displayed when user trys to enter too long name for a file or a folder.">
     This name is too long
   </message>
+  <message name="IDS_FILE_BROWSER_EMPTY_FOLDER" desc="Label shown in an empty folder.">
+    Nothing to see here...
+  </message>
   <message name="IDS_FILE_BROWSER_NEW_FOLDER_BUTTON_LABEL" desc="Label on the 'New folder' button.">
     New folder
   </message>
   <message name="IDS_FILE_BROWSER_NEW_WINDOW_BUTTON_LABEL" desc="Label on the 'New window' button.">
     New window
   </message>
   <message name="IDS_FILE_BROWSER_FILENAME_LABEL" desc="Filename text area label.">
     File name
   </message>
   <message name="IDS_FILE_BROWSER_PREPARING_LABEL" desc="Label informing about preparing the file.">
@@ skipping 5996 matching lines @@
     Enable MTP write support in file manager. Some operations (editing an image on MTP volume) are not supported yet.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_MESSAGE" desc="Message in a notification about granted read-only pemissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read-only access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_NOTIFICATION_WRITABLE_MESSAGE" desc="Message in a notification about granted full permissions (read, write, delete, create files and directories) to a volume (eg. USB drive, SD card, MTP device) with the specified name to the extension.">
     Read and write access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex></ph> has been granted.
   </message>
 
 </grit-part>