Introducing remoting::Stoppable helper base class implementing asynchronous shutdown on a specific t

remoting/host/wts_session_process_launcher_win.h

Index: remoting/host/wts_session_process_launcher_win.h
diff --git a/remoting/host/wts_session_process_launcher_win.h b/remoting/host/wts_session_process_launcher_win.h
index e0301f17966536c52f31557e361f8a6caa3b9c93..a0c3885a110dd71d8129575c81bbade05802439a 100644
--- a/remoting/host/wts_session_process_launcher_win.h
+++ b/remoting/host/wts_session_process_launcher_win.h
@@ -18,11 +18,11 @@
 #include "base/win/scoped_handle.h"
 #include "base/win/object_watcher.h"
 #include "ipc/ipc_channel.h"
-
+#include "remoting/base/shutdownable.h"
 #include "remoting/host/wts_console_observer_win.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 } // namespace base
 
 namespace IPC {
@@ -39,7 +39,8 @@ class SasInjector;
 class WtsConsoleMonitor;
 
 class WtsSessionProcessLauncher
-    : public base::win::ObjectWatcher::Delegate,
+    : public Shutdownable,
+      public base::win::ObjectWatcher::Delegate,
       public IPC::Listener,
       public WtsConsoleObserver {
  public:
@@ -48,10 +49,11 @@ class WtsSessionProcessLauncher
   // |monitor| should happen on |main_message_loop|. |ipc_message_loop| has
   // to be an I/O message loop.
   WtsSessionProcessLauncher(
+      const Shutdownable::Callback& done,
       WtsConsoleMonitor* monitor,
       const FilePath& host_binary,
-      scoped_refptr<base::MessageLoopProxy> main_message_loop,
-      scoped_refptr<base::MessageLoopProxy> ipc_message_loop);
+      scoped_refptr<base::SingleThreadTaskRunner> main_message_loop,
+      scoped_refptr<base::SingleThreadTaskRunner> ipc_message_loop);
 
   virtual ~WtsSessionProcessLauncher();
 
@@ -65,6 +67,10 @@ class WtsSessionProcessLauncher
   virtual void OnSessionAttached(uint32 session_id) OVERRIDE;
   virtual void OnSessionDetached() OVERRIDE;
 
+ protected:
+  // Shutdownable implementation.
+  virtual void DoShutdown() 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
@@ -88,10 +94,10 @@ class WtsSessionProcessLauncher
   base::OneShotTimer<WtsSessionProcessLauncher> timer_;
 
   // The main service message loop.
-  scoped_refptr<base::MessageLoopProxy> main_message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> main_message_loop_;
 
   // Message loop used by the IPC channel.
-  scoped_refptr<base::MessageLoopProxy> ipc_message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> ipc_message_loop_;
 
   // This pointer is used to unsubscribe from session attach and detach events.
   WtsConsoleMonitor* monitor_;