[CrOS Tether] Add HasConnectedToHost property for Tether networks.

components/onc/docs/onc_spec.md

Index: components/onc/docs/onc_spec.md
diff --git a/components/onc/docs/onc_spec.md b/components/onc/docs/onc_spec.md
index c42e357c90948403a51e07eae68fe8024a726af9..de07cb08f9a0bc76141dc5600a9e14d9e09ab9c0 100644
--- a/components/onc/docs/onc_spec.md
+++ b/components/onc/docs/onc_spec.md
@@ -1456,6 +1456,12 @@ a phone.
     * The name of the cellular carrier when the hotspot is provided by a
       cellular connection.
 
+* **HasConnectedToHost**

[stevenjb, 2017/04/27 19:28:53]

I don't love this name. I'm not sure I have a great alternative, maybe something
like 'Authenticated', although that may not quite be right? If you and Ryan are
in agreement then I'm fine with this, just a heads up that it's a bit confusing,
at least to me.

[Kyle Horimoto, 2017/04/27 19:40:23]

Unfortunately, "Authenticated" doesn't apply to this situation. I think
"HasConnectedToHost" is the best choice.

[stevenjb, 2017/04/27 19:47:32]

As long as you and Ryan and/or Jeremy are in agreement.

+    * (read-only) - **boolean**
+    * If *true*, the current device has already connected to a Tether network
+      created by the same external device which is providing this Tether
+      network.
+
 * **SignalStrength**
     * (optional, read-only) - **integer**
     * The current signal strength for the hotspot's connection in the range