Add new shill client for VPN

chromeos/dbus/shill_third_party_vpn_observer.h

Index: chromeos/dbus/shill_third_party_vpn_observer.h
diff --git a/chromeos/dbus/shill_third_party_vpn_observer.h b/chromeos/dbus/shill_third_party_vpn_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..e9b4cc8cfdd61a4a28cfd0be6793748119fe960f
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+++ b/chromeos/dbus/shill_third_party_vpn_observer.h
@@ -0,0 +1,28 @@
+// Copyright 2014 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 CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_OBSERVER_H_
+#define CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_OBSERVER_H_
+
+#include "base/basictypes.h"
+
+namespace chromeos {
+
+// This is a base class for observers which handle signals sent by the
+// ThirdPartyVpnAdaptor in Shill.
+class ShillThirdPartyVpnObserver {
+ public:
+  // Ownership of |data| belongs to the caller, hence the contents should be
+  // consumed before the call returns, i.e., pointer should not be dereferenced
+  // after the function returns.
+  virtual void OnPacketReceived(const uint8* data, size_t length) = 0;
+  virtual void OnPlatformMessage(uint32 message) = 0;
+
+ protected:
+  virtual ~ShillThirdPartyVpnObserver() {}
+};
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_DBUS_SHILL_THIRD_PARTY_VPN_OBSERVER_H_