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

components/arc/net/arc_net_host_impl.cc

Index: components/arc/net/arc_net_host_impl.cc
diff --git a/components/arc/net/arc_net_host_impl.cc b/components/arc/net/arc_net_host_impl.cc
index bca78b13c03447ef42e2e64027f8a2d93671a298..24405aaa2b5dde920e335cdb6d61604e2dd0d7d8 100644
--- a/components/arc/net/arc_net_host_impl.cc
+++ b/components/arc/net/arc_net_host_impl.cc
@@ -26,6 +26,10 @@ const int kGetNetworksListLimit = 100;
 
 namespace arc {
 
+chromeos::NetworkStateHandler* GetStateHandler() {
+  return chromeos::NetworkHandler::Get()->network_state_handler();
+}
+
 ArcNetHostImpl::ArcNetHostImpl(ArcBridgeService* bridge_service)
     : ArcService(bridge_service), binding_(this) {
   arc_bridge_service()->AddObserver(this);
@@ -100,12 +104,14 @@ void ArcNetHostImpl::GetNetworks(bool configured_only,
 
 void ArcNetHostImpl::GetWifiEnabledState(
     const GetWifiEnabledStateCallback& callback) {
-  chromeos::NetworkStateHandler* handler =
-      chromeos::NetworkHandler::Get()->network_state_handler();
-  bool is_enabled =
-      handler->IsTechnologyEnabled(chromeos::NetworkTypePattern::WiFi());
+  bool is_enabled = GetStateHandler()->IsTechnologyEnabled(
+      chromeos::NetworkTypePattern::WiFi());
 
   callback.Run(is_enabled);
 }
 
+void ArcNetHostImpl::StartScan() {
+  GetStateHandler()->RequestScan();

[dcheng, 2016/02/13 02:32:01]

How does ARC++ know when this is done?

[abhishekbh, 2016/02/16 22:00:05]

This API mimics the Android startScan API which is async. Another CL will be
sent out when the completion of this event and its results will be sent from
Host to ARC. 

+}
+
 }  // namespace arc