Lock screensaver window directly

By passing the window pointer to ScreenSaverRunner contructor and using that
to lock the window when drawing instead of getting the window from the
Window() method of the view. This is safer.

headers/private/screen_saver/ScreenSaverRunner.h

@@ -14,13 +14,15 @@
 
 #include <ScreenSaver.h>
 #include <View.h>
+#include <Window.h>
 
 #include "ScreenSaverSettings.h"
 
 
 class ScreenSaverRunner {
 public:
-								ScreenSaverRunner(BView* view,
+								ScreenSaverRunner(BWindow* window,
+									BView* view,
 									ScreenSaverSettings& settings);
 								~ScreenSaverRunner();
 
@@ -38,6 +40,7 @@ private:
 	static	status_t			_ThreadFunc(void* data);
 			status_t			_Run();
 
+			BWindow*			fWindow;
 			BView*				fView;
 			bool				fIsDirectDraw;
 			ScreenSaverSettings& fSettings;