arc: Reduce logspam when ARC is not enabled/available

components/arc/net/arc_net_host_impl.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_ARC_NET_ARC_NET_HOST_IMPL_H_
 #define COMPONENTS_ARC_NET_ARC_NET_HOST_IMPL_H_
 
 #include <stdint.h>
 #include <memory>
 #include <string>
@@ skipping 62 matching lines @@
 
   // Overriden from chromeos::NetworkStateHandlerObserver.
   void ScanCompleted(const chromeos::DeviceState* /*unused*/) override;
   void OnShuttingDown() override;
   void DefaultNetworkChanged(const chromeos::NetworkState* network) override;
   void DeviceListChanged() override;
   void GetDefaultNetwork(const GetDefaultNetworkCallback& callback) override;
 
   // Overridden from ArcBridgeService::InterfaceObserver<mojom::NetInstance>:
   void OnInstanceReady() override;
+  void OnInstanceClosed() override;
 
  private:
   void DefaultNetworkSuccessCallback(const std::string& service_path,
                                      const base::DictionaryValue& dictionary);
 
   // Due to a race in Chrome, GetNetworkStateFromGuid() might not know about
   // newly created networks, as that function relies on the completion of a
   // separate GetProperties shill call that completes asynchronously.  So this
   // class keeps a local cache of the path->guid mapping as a fallback.
   // This is sufficient to pass CTS but it might not handle multiple
   // successive Create operations (crbug.com/631646).
   bool GetNetworkPathFromGuid(const std::string& guid, std::string* path);
 
   void CreateNetworkSuccessCallback(
       const mojom::NetHost::CreateNetworkCallback& mojo_callback,
       const std::string& service_path,
       const std::string& guid);
 
   void CreateNetworkFailureCallback(
       const mojom::NetHost::CreateNetworkCallback& mojo_callback,
       const std::string& error_name,
       std::unique_ptr<base::DictionaryValue> error_data);
 
+  // True if the chrome::NetworkStateHandler is currently being observed for
+  // state changes.
+  bool observing_network_state_ = false;
+
   std::string cached_service_path_;
   std::string cached_guid_;
 
   base::ThreadChecker thread_checker_;
   mojo::Binding<mojom::NetHost> binding_;
   base::WeakPtrFactory<ArcNetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcNetHostImpl);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_NET_ARC_NET_HOST_IMPL_H_