Add a notification about auto-granted access to file systems.

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 6117 matching lines @@
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_DIALOG_WRITABLE_MESSAGE" desc="Message in a prompt dialog for granting 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.">
     Do you want to grant full permissions to read, write, delete and create files on <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex>?</ph>
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_DIALOG_YES_BUTTON" desc="Label on the button to grant permissions.">
     Yes
   </message>
   <message name="IDS_FILE_SYSTEM_REQUEST_FILE_SYSTEM_DIALOG_NO_BUTTON" desc="Label on the button to reject permissions.">
     No
   </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> has been granted.</ph>
+  </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.">
+    Full access to <ph name="VOLUME_NAME">$1<ex>FooBar 4GB</ex> has been granted.</ph>

[jww, 2015/03/26 20:14:59]

Instead of "Full access," which sounds ambiguous, can you rewrite as "read and
write"? We've been aiming to use "read and write" whenever possible in
extensions instead of "access".

[mtomasz, 2015/03/26 23:24:11]

Is "Read and write access to XXX has been granted." OK?

[mtomasz, 2015/03/27 05:01:38]

Done.

+  </message>
+
 </grit-part>