interface in android

D:\linux\linuxkernel\src\cm10.1\frameworks\base\services\java\com\android\server\SystemServer.java
            display.setWindowManager(wm);
D:\linux\linuxkernel\src\cm10.1\frameworks\base\services\java\com\android\server\wm\WindowManagerService.java
public class WindowManagerService extends IWindowManager.Stub
        implements Watchdog.Monitor, WindowManagerPolicy.WindowManagerFuncs,
                DisplayManagerService.WindowManagerFuncs, DisplayManager.DisplayListener {
D:\linux\linuxkernel\src\cm10.1\frameworks\base\services\java\com\android\server\display\DisplayManagerService.java
    /**
     * Called during initialization to associate the display manager with the
     * window manager.
     */
    public void setWindowManager(WindowManagerFuncs windowManagerFuncs) {
        synchronized (mSyncRoot) {
            mWindowManagerFuncs = windowManagerFuncs;
            scheduleTraversalLocked(false);
        }
    }