Introduce proximity_auth component.

components/proximity_auth/proximity_auth_system.h

+// 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 COMPONENTS_PROXIMITY_AUTH_PROXIMITY_AUTH_SYSTEM_H
+#define COMPONENTS_PROXIMITY_AUTH_PROXIMITY_AUTH_SYSTEM_H
+
+#include "base/macros.h"
+#include "components/proximity_auth/remote_device.h"
+
+namespace proximity_auth {
+
+// This is the main entry point to start Proximity Auth, the underlying system
+// for the Easy Unlock and Easy Sign-in features. Given a list of registered
+// remote devices (ie. phones), this object will handle the connection,

[Ilya Sherman, 2014/08/27 03:18:33]

nit: "ie." -> "i.e."

[Tim Song, 2014/08/27 19:40:05]

Done.

+// authentication, and protocol for all the devices.
+class ProximityAuthSystem {
+ public:
+  ProximityAuthSystem(const RemoteDeviceList& remote_devices);
+  virtual ~ProximityAuthSystem();
+
+  const RemoteDeviceList& GetRemoteDevices();
+
+ private:
+  RemoteDeviceList remote_devices_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProximityAuthSystem);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_PROXIMITY_AUTH_SYSTEM_H