Enable experimental support for sub-pixel font scaling

Enable experimental support for sub-pixel font scaling

Enable sub-css-pixel font scaling as an experimental web feature.
This would allow for things like font-size: 12.5px which would map to
25 device pixels on a high dpi display or when zoomed in.
It also allows for smoother text scaling and consistent sizing across
zoom levels.

R=dglazkov@chromium.org
BUG=290411
TEST=fast/text/sub-pixel/text-scaling*

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162893

[dglazkov, 2013-11-18 22:56:59]

lgtm, though this patch seems to include that other one.

[eae, 2013-11-18 23:01:01]

On 2013/11/18 22:56:59, Dimitri Glazkov wrote:
> lgtm, though this patch seems to include that other one.

Yeah, needed to upload it that way to make the bots happy. Will land in order.

Thanks!

[commit-bot: I haz the power, 2013-11-29 09:48:19]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/eae@chromium.org/25512005/162001

[commit-bot: I haz the power, 2013-11-29 11:12:53]

Change committed as 162893

[eseidel, 2013-11-30 02:54:46]

I think this broke several SVG text-related tests?
svg/batik/text/textProperties.svg
svg/batik/text/textLayout2.svg
see garden-o-matic.appspot.com

[eae, 2013-11-30 03:03:57]

On Sat, Nov 30, 2013 at 10:54 AM,  <eseidel@chromium.org> wrote:
> I think this broke several SVG text-related tests?
> svg/batik/text/textProperties.svg
> svg/batik/text/textLayout2.svg
> see garden-o-matic.appspot.com

Yeah, some of the rebaselines got messed up, seems like the lion and
snowleopard ones got swapped.

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