Add tests for negative border-image-width and border-image-outset

Add tests for negative border-image-width and border-image-outset

BUG=318081
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162531

[Julien - ping for review, 2013-11-21 21:30:33]

lgtm

https://codereview.chromium.org/79543006/diff/1/LayoutTests/fast/borders/bord...
File LayoutTests/fast/borders/border-image-width-negative.html (right):

https://codereview.chromium.org/79543006/diff/1/LayoutTests/fast/borders/bord...
LayoutTests/fast/borders/border-image-width-negative.html:4: <title>Test that
negative border image width values are ignored</title>
I usually advice people not to use <title> as they don't get dumped off. 

Here, this is an important description of the test so it should be included in
the dump.

https://codereview.chromium.org/79543006/diff/1/LayoutTests/fast/borders/bord...
LayoutTests/fast/borders/border-image-width-negative.html:16:
border-image-outset: 1 2 3 -0.1;
Shouldn't you also test the 3 number parsing? (same comment for
border-image-width)

[commit-bot: I haz the power, 2013-11-22 08:08:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davve@opera.com/79543006/60001

[commit-bot: I haz the power, 2013-11-22 09:20:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davve@opera.com/79543006/200001

[commit-bot: I haz the power, 2013-11-22 10:21:54]

Change committed as 162531