Introduce proximity_auth component.

components/proximity_auth/proximity_auth_system.h

Index: components/proximity_auth/proximity_auth_system.h
diff --git a/components/proximity_auth/proximity_auth_system.h b/components/proximity_auth/proximity_auth_system.h
new file mode 100644
index 0000000000000000000000000000000000000000..1cef1cd6b86b418f7e432c402238b61f917bfd4a
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+++ b/components/proximity_auth/proximity_auth_system.h
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+// 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 (i.e. phones), this object will handle the connection,
+// authentication, and protocol for all the devices.
+class ProximityAuthSystem {
+ public:
+  ProximityAuthSystem(const std::vector<RemoteDevice>& remote_devices);
+  virtual ~ProximityAuthSystem();
+
+  const std::vector<RemoteDevice>& GetRemoteDevices();
+
+ private:
+  std::vector<RemoteDevice> remote_devices_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProximityAuthSystem);
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_PROXIMITY_AUTH_SYSTEM_H