list-style-image with SVG image renders at incorrect size.

list-style-image with SVG image renders at incorrect size.
https://bugs.webkit.org/show_bug.cgi?id=141367.

Patch by Said Abou-Hallawa <sabouhallawa@apple.com> on 2015-04-13
Reviewed by Darin Adler.
Source/WebCore:

This patch imports https://codereview.chromium.org/197203003.

When using an SVG as list marker image, don't unconditionally set the
dimensions to a square with the dimensions of ascent / 2, but rather
determine a suitable size using intrinsic dimensions (and ratio).

Test: svg/as-list-image/svg-list-image-intrinsic-size-1.html

* rendering/RenderListMarker.cpp:
(WebCore::RenderListMarker::updateContent):

LayoutTests:

Ensure the SVG image gets the correct size when used as an image list.

* svg/as-list-image: Added.
* svg/as-list-image/svg-list-image-intrinsic-size-1-expected.html: Added.
* svg/as-list-image/svg-list-image-intrinsic-size-1.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182751 268f45cc-cd09-0410-ab3c-d52691b4dbfc