Add a row in the network tray to inform users to turn Bluetooth on to enable Tether.

ash/ash_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains the strings for ash.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/ash_strings.h" type="rc_header">
@@ skipping 874 matching lines @@
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_PROHIBITED" desc="Tooltip in network list when no network is prohibited by policy.">
         This network is disabled by your administrator.
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NO_NETWORKS" desc="The message to display in the network info bubble when it is otherwise empty.">
         No network information available
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NO_MOBILE_NETWORKS" desc="The message to display in the network list when no mobile networks are available.">
         No mobile network available
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_ENABLE_BLUETOOTH" desc="The message to display in the network list when Tether is enabled but Bluetooth is disabled.">
+        Turn on Bluetooth to discover nearby devices
+      </message>
       <message name="IDS_ASH_STATUS_TRAY_VPN_DISCONNECTED" desc="The label used in system tray bubble to display vpn is disconnected.">
         VPN disconnected
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_WIFI_ENABLED" desc="The label used in the tray popup to notify that Wi-Fi is turned on.">
         Wi-Fi is turned on.
       </message>
       <message name="IDS_ASH_STATUS_TRAY_NETWORK_WIFI_DISABLED" desc="The label used in the tray popup to notify that Wi-Fi is turned off.">
         Wi-Fi is turned off.
       </message>
       <message name="IDS_ASH_STATUS_TRAY_WIFI_SCANNING_MESSAGE" desc="Scanning for wifi networks">
@@ skipping 157 matching lines @@
 
       <!-- Tray scale strings -->
       <message name="IDS_ASH_STATUS_TRAY_SCALE" desc="The label used in scale setting detailed page of ash tray popup.">
         Display scale settings
       </message>
       <message name="IDS_ASH_STATUS_TRAY_SCALE_SLIDER" desc="The accessible text for the scale slider">Display scale</message>
     </messages>
   </release>
 </grit>