[DirectWrite] Add support for font-stretch suffixes

[DirectWrite] Add support for font-stretch suffixes

Add support for font family names with a font-stretch suffix (such as
Condensed, UltaExpanded, Narrow etc). If the full name fails to match an
installed font check for a font-stretch suffix and if so strip it and
set the stretch value according to the suffix.

The current implementation matches IE when it comes to picking or
overriding the stretch value based on the suffix.

The coresponding logic for font-weight suffix matching was implemented
in r181493.

TEST=fast/text/font-stretch-variant.html
BUG=410940
R=cpu@chromium.org, dglazkov@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182061

[cpu_(ooo_6.6-7.5), 2014-09-16 00:03:33]

lgtm

[eae, 2014-09-16 00:08:03]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-09-16 00:09:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/550093005/20001

[commit-bot: I haz the power, 2014-09-16 02:09:41]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-16 02:09:43]

Exceeded time limit waiting for builds to trigger.

[eae, 2014-09-16 15:19:04]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-09-16 15:19:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/550093005/20001

[commit-bot: I haz the power, 2014-09-16 15:52:19]

Committed patchset #2 (id:20001) as 182061