shill: Notify upstart when shill is connected.

Add an upstart event whenever shill is connected.

BUG=brillo:970
TEST=`P2_TEST_FILTER="shill::ManagerTest.RefreshConnectionState"
FEATURES=test emerge-${BOARD} shill`

Change-Id: I5fdf980da5067bf9a77cfb4e47b4e38b026c8b27
Reviewed-on: https://chromium-review.googlesource.com/268895
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Roshan Pius <rpius@chromium.org>
Commit-Queue: Roshan Pius <rpius@chromium.org>
diff --git a/manager.h b/manager.h
index 33e8659..a3d2dbf 100644
--- a/manager.h
+++ b/manager.h
@@ -836,6 +836,9 @@
   // When true, suppresses autoconnects in Manager::AutoConnect.
   bool suppress_autoconnect_;
 
+  // Whether any of the services is in connected state or not.
+  bool is_connected_state_;
+
   DISALLOW_COPY_AND_ASSIGN(Manager);
 };