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

ash/ash_strings.grd

Index: ash/ash_strings.grd
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index 42523a3f4f263249915aafa11eba39510b36ce49..54e2e3a7d29cd98087f00fcca918b34ca9004a5d 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -885,6 +885,9 @@ Press Search or Shift to cancel.
       <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.

[Kyle Horimoto, 2017/06/27 19:36:56]

Can you please double-check with the UX folks to make sure we're supposed to
have a period at the end of the sentence? I know it appears in the mocks, but I
just wanted to make sure, since some of the other status tray strings (like the
two above this one) don't have one. Thanks!

[lesliewatkins, 2017/07/07 16:19:19]

Email sent, will follow up with response.

+      </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>