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

remoting/host/win/wts_session_process_launcher.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_SESSION_PROCESS_LAUNCHER_H_
-#define REMOTING_HOST_WIN_WTS_SESSION_PROCESS_LAUNCHER_H_
-
-#include <windows.h>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/file_path.h"
-#include "base/file_util.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
-#include "base/process.h"
-#include "base/time.h"
-#include "base/timer.h"
-#include "base/win/scoped_handle.h"
-#include "ipc/ipc_channel.h"
-#include "remoting/base/stoppable.h"
-#include "remoting/host/win/worker_process_launcher.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 WtsConsoleMonitor;
-class WtsSessionProcessLauncherImpl;
-
-class WtsSessionProcessLauncher
-    : public Stoppable,
-      public WorkerProcessIpcDelegate,
-      public WtsConsoleObserver {
- public:
-  // Constructs a WtsSessionProcessLauncher object. |stopped_callback| and
-  // |main_message_loop| are passed to the undelying |Stoppable| implementation.
-  // All interaction with |monitor| should happen on |main_message_loop|.
-  // |ipc_message_loop| must be an I/O message loop.
-  WtsSessionProcessLauncher(
-      const base::Closure& stopped_callback,
-      WtsConsoleMonitor* monitor,
-      scoped_refptr<base::SingleThreadTaskRunner> main_message_loop,
-      scoped_refptr<base::SingleThreadTaskRunner> ipc_message_loop);
-
-  virtual ~WtsSessionProcessLauncher();
-
-  // WorkerProcessIpcDelegate implementation.
-  virtual void OnChannelConnected() OVERRIDE;
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
-  // WtsConsoleObserver implementation.
-  virtual void OnSessionAttached(uint32 session_id) OVERRIDE;
-  virtual void OnSessionDetached() OVERRIDE;
-
- protected:
-  // Stoppable implementation.
-  virtual void DoStop() OVERRIDE;
-
- private:
-  // Attempts to launch the host process in the current console session.
-  // Schedules next launch attempt if creation of the process fails for any
-  // reason.
-  void LaunchProcess();
-
-  // Called when the launcher reports the process to be stopped.
-  void OnLauncherStopped();
-
-  // |true| if this object is currently attached to the console session.
-  bool attached_;
-
-  // Path to the host binary to launch.
-  FilePath host_binary_;
-
-  // OS version dependent WorkerProcessLauncher::Delegate implementation
-  // instance for the currently-running child process.
-  scoped_refptr<WtsSessionProcessLauncherImpl> impl_;
-
-  // WorkerProcessLauncher::Delegate implementation that will be used to launch
-  // the new child process after a session switch.
-  scoped_refptr<WtsSessionProcessLauncherImpl> new_impl_;
-
-  // Time of the last launch attempt.
-  base::Time launch_time_;
-
-  // Current backoff delay.
-  base::TimeDelta launch_backoff_;
-
-  // Timer used to schedule the next attempt to launch the process.
-  base::OneShotTimer<WtsSessionProcessLauncher> timer_;
-
-  // The main service message loop.
-  scoped_refptr<base::SingleThreadTaskRunner> main_message_loop_;
-
-  // Message loop used by the IPC channel.
-  scoped_refptr<base::SingleThreadTaskRunner> ipc_message_loop_;
-
-  // This pointer is used to unsubscribe from session attach and detach events.
-  WtsConsoleMonitor* monitor_;
-
-  scoped_ptr<WorkerProcessLauncher> launcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(WtsSessionProcessLauncher);
-};
-
-}  // namespace remoting
-
-#endif  // REMOTING_HOST_WIN_WTS_SESSION_PROCESS_LAUNCHER_H_