Create NetBiosClientInterface

This change creates the NetBiosClientInterface. This interface will allow
us to create a FakeNetBiosClient that can be injected into the
NetBiosHostLocator class for testing.

Bug: chromium:757625
Change-Id: Iadf5965ce43a504f5babe2220944d91b48b9d537
Reviewed-on: https://chromium-review.googlesource.com/1081299
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565375}

chrome/browser/chromeos/smb_client/discovery/netbios_client_interface.h

+// Copyright 2018 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 CHROME_BROWSER_CHROMEOS_SMB_CLIENT_DISCOVERY_NETBIOS_CLIENT_INTERFACE_H_
+#define CHROME_BROWSER_CHROMEOS_SMB_CLIENT_DISCOVERY_NETBIOS_CLIENT_INTERFACE_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+
+namespace net {
+
+class IPAddress;
+class IPEndPoint;
+
+}  // namespace net
+
+namespace chromeos {
+namespace smb_client {
+
+using NetBiosResponseCallback = base::RepeatingCallback<
+    void(const std::vector<uint8_t>&, uint16_t, const net::IPEndPoint&)>;
+
+class NetBiosClientInterface {
+ public:
+  virtual ~NetBiosClientInterface() = default;
+
+  // Starts the Name Query Request process. Any response packets that match
+  // |transaction_id| are passed to |callback|.
+  virtual void ExecuteNameRequest(const net::IPAddress& broadcast_address,
+                                  uint16_t transaction_id,
+                                  NetBiosResponseCallback callback) = 0;
+
+ protected:
+  NetBiosClientInterface() = default;
+
+  DISALLOW_COPY_AND_ASSIGN(NetBiosClientInterface);
+};
+
+}  // namespace smb_client
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SMB_CLIENT_DISCOVERY_NETBIOS_CLIENT_INTERFACE_H_