[Chromoting] Reimplemented the worker process launcher to take into account the encountered issues:

remoting/host/win/wts_console_session_process_driver.h

+// Copyright (c) 2012 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 REMOTING_HOST_WIN_WTS_CONSOLE_SESSION_PROCESS_DRIVER_H_
+#define REMOTING_HOST_WIN_WTS_CONSOLE_SESSION_PROCESS_DRIVER_H_
+
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/base/stoppable.h"
+#include "remoting/host/win/wts_console_observer.h"
+#include "remoting/host/worker_process_ipc_delegate.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+} // namespace base
+
+namespace remoting {
+
+class WorkerProcessLauncher;
+class WtsConsoleMonitor;
+
+// Launches the host in the session attached to the console. When a new session
+// attaches to the console relaunches the host in it.
+class WtsConsoleSessionProcessDriver
+    : public Stoppable,
+      public WorkerProcessIpcDelegate,
+      public WtsConsoleObserver {
+ public:
+  // Constructs a WtsConsoleSessionProcessDriver object. |stopped_callback| will
+  // be invoked to notify the caller that the object is completely stopped. All
+  // public methods of this class must be invoked on the |caller_task_runner|
+  // thread. |monitor| will only be accessed from the |caller_task_runner|
+  // thread. |io_task_runner| must be an I/O message loop.
+  WtsConsoleSessionProcessDriver(
+      const base::Closure& stopped_callback,
+      WtsConsoleMonitor* monitor,
+      scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
+
+  virtual ~WtsConsoleSessionProcessDriver();
+
+  // WorkerProcessIpcDelegate implementation.
+  virtual void OnChannelConnected() OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnPermanentError() OVERRIDE;
+
+  // WtsConsoleObserver implementation.
+  virtual void OnSessionAttached(uint32 session_id) OVERRIDE;
+  virtual void OnSessionDetached() OVERRIDE;
+
+ protected:
+  // Stoppable implementation.
+  virtual void DoStop() OVERRIDE;
+
+ private:
+  // Task runner on which public methods of this class must be called.
+  scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;
+
+  // Message loop used by the IPC channel.
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  // Launches and monitors the worker process.
+  scoped_ptr<WorkerProcessLauncher> launcher_;
+
+  // Used to unsubscribe from session attach and detach events.
+  WtsConsoleMonitor* monitor_;
+
+  DISALLOW_COPY_AND_ASSIGN(WtsConsoleSessionProcessDriver);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_WIN_WTS_CONSOLE_SESSION_PROCESS_DRIVER_H_