ARC: Implement the startScan API to start scanning of WiFI APs.

components/arc/net/arc_net_host_impl.h

Index: components/arc/net/arc_net_host_impl.h
diff --git a/components/arc/net/arc_net_host_impl.h b/components/arc/net/arc_net_host_impl.h
index 7dfeb2e8b2216634708c6c72d5e7f2f7d6d0e497..9def7a5212c9822729cca9bf049a90ddb292b7e0 100644
--- a/components/arc/net/arc_net_host_impl.h
+++ b/components/arc/net/arc_net_host_impl.h
@@ -39,6 +39,9 @@ class ArcNetHostImpl : public ArcService,
   void GetWifiEnabledState(
       const GetWifiEnabledStateCallback& callback) override;
 
+  // Called when a StartScan call is sent from ARC.
+  void StartScan(const StartScanCallback& callback) override;
+
   // Overridden from ArcBridgeService::Observer:
   void OnNetInstanceReady() override;