Add interfaces for most major Blimp net components.

blimp/engine/net/engine_connection_manager.h

Index: blimp/engine/net/engine_connection_manager.h
diff --git a/blimp/engine/net/engine_connection_manager.h b/blimp/engine/net/engine_connection_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..86d41e1feb6ff412b16897fcf6b490c33da0d934
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+++ b/blimp/engine/net/engine_connection_manager.h
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+// Copyright 2015 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 BLIMP_ENGINE_NET_ENGINE_CONNECTION_MANAGER_H_
+#define BLIMP_ENGINE_NET_ENGINE_CONNECTION_MANAGER_H_
+
+#include "blimp/net/blimp_connection.h"
+#include "blimp/net/connection_handler.h"
+
+namespace blimp {
+
+// Coordinates the channel creation and authentication workflows for
+// incoming (Engine) network connections.
+class EngineConnectionManager : public ConnectionHandler,
+                                public BlimpConnection::DisconnectObserver {
+ public:
+  explicit EngineConnectionManager(ConnectionHandler* browser_session);
+
+  // Accepts new BlimpConnections from |transport_| as fast as they arrive.
+  void StartListening();
+
+  // ConnectionHandler implementation.
+  // Handles a new connection from a Transport and passes it to a new
+  // EngineAuthHandler.
+  void HandleConnection(scoped_ptr<BlimpConnection> connection) override;
+
+  // BlimpConnection::DisconnectObserver implementation.
+  void OnDisconnected() override;
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_NET_ENGINE_CONNECTION_MANAGER_H_