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

ash/system/network/network_icon.cc

Index: ash/system/network/network_icon.cc
diff --git a/ash/system/network/network_icon.cc b/ash/system/network/network_icon.cc
index f096341b7e0726c1cb28b4aa5dd2e0b492274219..0fcb08239e5ef7871a274c8585d195a4f4521f20 100644
--- a/ash/system/network/network_icon.cc
+++ b/ash/system/network/network_icon.cc
@@ -881,10 +881,13 @@ int GetMobileUninitializedMsg() {
   static int s_uninitialized_msg(0);
 
   NetworkStateHandler* handler = NetworkHandler::Get()->network_state_handler();
-  if (handler->GetTechnologyState(NetworkTypePattern::Mobile()) ==
+  if (handler->GetTechnologyState(NetworkTypePattern::Tether()) ==
       NetworkStateHandler::TECHNOLOGY_UNINITIALIZED) {

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

This condition also occurs if IsCellularAvailableButNotEnabled(). You also need
to check if that condition is true before displaying this message.

[Kyle Horimoto, 2017/06/29 19:24:32]

I added a quick CL to help you on this. Use
https://codereview.chromium.org/2969493002 once it lands to determine this.

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

Will incorporate as soon as this lands. Thanks for doing that!

-    // TODO (lesliewatkins): Add a more descriptive message (e.g. "Enable
-    // Bluetooth") for Tether technology type.
+    s_uninitialized_msg = IDS_ASH_STATUS_TRAY_ENABLE_BLUETOOTH;
+    s_uninitialized_state_time = base::Time::Now();
+    return s_uninitialized_msg;
+  } else if (handler->GetTechnologyState(NetworkTypePattern::Mobile()) ==

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

Does this change fix
https://bugs.chromium.org/p/chromium/issues/detail?id=735642? If so, please set
the BUG= number at the top.

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

Done.

+             NetworkStateHandler::TECHNOLOGY_UNINITIALIZED) {
     s_uninitialized_msg = IDS_ASH_STATUS_TRAY_INITIALIZING_CELLULAR;
     s_uninitialized_state_time = base::Time::Now();
     return s_uninitialized_msg;