ui_controls_mac_ll.mm

static void DoPostLLEvent(CGEventRef event, const base::Closure& task) {
  CGEventPost(kCGHIDEventTap, event);

  // "My guess is that the events are getting posted too quickly for the system
  // to handle (since it really only has to handle no more than,
  // say, 20 key events a second)."
  // http://stackoverflow.com/questions/6239140/cgkeyevent-pasting-working-with-breakpoints-but-not-without
  usleep(100000);  // wait 0.1 sec

  if (!task.is_null()) {
    base::MessageLoop::current()->PostTask(
        FROM_HERE, base::Bind(&EventQueueWatcher, task));
  }
}

bool SendMouseEventsLL(MouseButton type, int state) {
  CHECK(g_ui_controls_enabled);
  return SendMouseEventsNotifyWhenDoneLL(type, state, base::Closure());
}

bool SendMouseMoveNotifyWhenDoneLL(int x, int y, const base::Closure& task) {
  g_mouse_location = NSMakePoint(x, y);  // no flip in core graphics events!

  CGPoint click_point = CGPointMake(x, y);
  base::ScopedCFTypeRef<CGEventRef> move_event(
      CGEventCreateMouseEvent(NULL,
                              kCGEventMouseMoved,
                              click_point,
                              kCGMouseButtonLeft));  // ignored

  DoPostLLEvent(move_event, task);

  return true;
}


bool SendMouseEventsNotifyWhenDoneLL(MouseButton type, int state,
                                   const base::Closure& task) {
  // On windows it appears state can be (UP|DOWN).  It is unclear if
  // that'll happen here but prepare for it just in case.
  if (state == (UP|DOWN)) {
    return (SendMouseEventsNotifyWhenDoneLL(
                type, DOWN, base::Closure()) &&
            SendMouseEventsNotifyWhenDoneLL(
                type, UP, task));
  }

  CGEventType etype = 0;
  CGMouseButton mouse_button = 0;
  if (type == LEFT) {
    mouse_button = kCGMouseButtonLeft;
    if (state == UP) {
      etype = kCGEventLeftMouseUp;
    } else {
      etype = kCGEventLeftMouseDown;
    }
  } else if (type == MIDDLE) {
    mouse_button = kCGMouseButtonRight;
    if (state == UP) {
      etype = kCGEventOtherMouseUp;
    } else {
      etype = kCGEventOtherMouseDown;
    }
  } else if (type == RIGHT) {
    mouse_button = kCGMouseButtonCenter;
    if (state == UP) {
      etype = kCGEventRightMouseUp;
    } else {
      etype = kCGEventRightMouseDown;
    }
  } else {
    return false;
  }

  base::ScopedCFTypeRef<CGEventRef> event(
        CGEventCreateMouseEvent(NULL,
                                etype,
                                NSPointToCGPoint(g_mouse_location),
                                mouse_button));

  DoPostLLEvent(event, task);

  return true;
}