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..4bd9ec4e1ebfcea45e8d6fd955fa6fff73e58dfd 100644
--- a/ash/system/network/network_icon.cc
+++ b/ash/system/network/network_icon.cc
@@ -881,10 +881,15 @@ int GetMobileUninitializedMsg() {
   static int s_uninitialized_msg(0);
 
   NetworkStateHandler* handler = NetworkHandler::Get()->network_state_handler();
-  if (handler->GetTechnologyState(NetworkTypePattern::Mobile()) ==
+  // TODO (lesliewatkins): Only return this message when Tether is uninitialized

[James Cook, 2017/07/10 18:43:03]

nit: no space after TODO

[lesliewatkins, 2017/07/12 21:49:49]

Done.

+  // due to no Bluetooth (dependent on 2969493002).

[James Cook, 2017/07/10 18:43:03]

nit: b/12345 for internal bugs (assuming that's an internal bug number), or cite
a crbug.

[Kyle Horimoto, 2017/07/10 19:15:37]

It's actually a Chromium CL number: https://codereview.chromium.org/2969493002/

[lesliewatkins, 2017/07/12 21:49:49]

Changed!

+  if (handler->GetTechnologyState(NetworkTypePattern::Tether()) ==
       NetworkStateHandler::TECHNOLOGY_UNINITIALIZED) {
-    // 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()) ==
+             NetworkStateHandler::TECHNOLOGY_UNINITIALIZED) {
     s_uninitialized_msg = IDS_ASH_STATUS_TRAY_INITIALIZING_CELLULAR;
     s_uninitialized_state_time = base::Time::Now();
     return s_uninitialized_msg;