[Blimp] Adds Blimp EngineSession and ClientSession skeleton

blimp/engine/browser/blimp_client_session_manager.h

Index: blimp/engine/browser/blimp_client_session_manager.h
diff --git a/blimp/engine/browser/blimp_client_session_manager.h b/blimp/engine/browser/blimp_client_session_manager.h
new file mode 100644
index 0000000000000000000000000000000000000000..5746db251ad584377d655a541b960c3930e8f1bf
--- /dev/null
+++ b/blimp/engine/browser/blimp_client_session_manager.h
@@ -0,0 +1,43 @@
+// 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_BROWSER_BLIMP_CLIENT_SESSION_MANAGER_H_
+#define BLIMP_ENGINE_BROWSER_BLIMP_CLIENT_SESSION_MANAGER_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace net {
+class NetLog;
+}
+
+namespace blimp {
+namespace engine {
+
+class BlimpClientSession;
+class BlimpClientSessionManagerDelegate;
+
+class BlimpClientSessionManager {
+ public:
+  // Caller owns |delegate| and |net_log|.
+  BlimpClientSessionManager(BlimpClientSessionManagerDelegate* delegate,
+                            net::NetLog* net_log);
+  ~BlimpClientSessionManager();
+
+  void AttachTestClientSession();

[Kevin M, 2015/10/14 17:52:57]

Recommend adding a separate testing constructor that accepts a
scoped_ptr<BlimpClientSession> test_session. It doesn't make much sense to allow
the client session to be attached at arbitrary points in the BCSM's lifetime.

[haibinlu, 2015/10/15 01:59:28]

Done.

+
+ private:
+  BlimpClientSessionManagerDelegate* delegate_;
+  net::NetLog* net_log_;
+  scoped_ptr<BlimpClientSession> active_session_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpClientSessionManager);
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_BROWSER_BLIMP_CLIENT_SESSION_MANAGER_H_