Add background image option for Browser

[aurishhammadhafeez]

Feature Request

Motivation Behind Feature

It is very hard to make textured splash screen responsive, this will help solve the splash screen with textured backgrounds.

Feature Description

<preference name="SplashScreenBackgroundImage" value="path/to/image" />
<preference name="SplashScreenBackgroundRepeat" value="repeat|repeat-x|repeat-y|no-repeat|initial|inherit;" />

This should activate properties to the parent div
background-image: ;
background-repeat: ;

Alternatives or Workarounds

Adding an image big enough so that no white spaces are displayed