RenderImage ignores its percent width/height when setContainerSizeForRenderer

RenderImage ignores its percent width/height when setContainerSizeForRenderer
https://bugs.webkit.org/show_bug.cgi?id=80431

Add a test case for Bug 80431. It renders a 1x1 svg as an image with percent
width/height specified.

Patch by Yong Li <yoli@rim.com> on 2012-04-16
Reviewed by Nikolas Zimmermann.

* svg/as-image/resources/rect-1x1.svg: Added.
* svg/as-image/svg-as-image-with-relative-size-expected.html: Added.
* svg/as-image/svg-as-image-with-relative-size.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114290 268f45cc-cd09-0410-ab3c-d52691b4dbfc