ppapi: PPB_VpnProvider: Implement Service Helper

content/public/browser/vpn_service_proxy.h

+// Copyright 2016 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 CONTENT_PUBLIC_BROWSER_VPN_SERVICE_PROXY_H_
+#define CONTENT_PUBLIC_BROWSER_VPN_SERVICE_PROXY_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/callback.h"
+#include "content/common/content_export.h"
+
+namespace content {
+class PepperVpnProviderResourceHostProxy;
+
+// Describes interface for communication with an external VpnService.
+// All the methods below can only be called on the UI thread.
+class CONTENT_EXPORT VpnServiceProxy {
+ public:
+  using SuccessCallback = base::Closure;
+  using FailureCallback =
+      base::Callback<void(const std::string& error_name,
+                          const std::string& error_message)>;
+
+  virtual ~VpnServiceProxy() {}
+
+  // Binds an existing VPN connection in the VpnService. Registers with the
+  // VpnService the Resource host back-end.
+  virtual void Bind(const std::string& host_id,
+                    const std::string& configuration_id,
+                    const std::string& configuration_name,
+                    const SuccessCallback& success,
+                    const FailureCallback& failure,
+                    std::unique_ptr<PepperVpnProviderResourceHostProxy>
+                        pepper_vpn_provider_proxy) = 0;
+
+  // Sends an IP packet to the VpnService.
+  virtual void SendPacket(const std::string& host_id,
+                          const std::vector<char>& data,
+                          const SuccessCallback& success,
+                          const FailureCallback& failure) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_VPN_SERVICE_PROXY_H_