It would be nice to have a method to perform drag in DeviceUtils class

[viveksalvi]

hi All,

I had a requirement where swipe wouldn't work because it is too fast, and duration couldn't be controlled.
Whereas in case of drag we can control the duration of drag operation.

So I came up with this snippet

    public static void drag(String location, String duration){
        Map<String, String> params = new HashMap();
        params.put("location", location);
        params.put("duration", duration);
        getQAFDriver().executeScript("mobile:touch:drag", params);
    }

It would be nice to have this method in DeviceUtils class.

[viveksalvi]

Let me know, if I should create pull request for this.