Make fast/text/justify-ideograph.html more reliable

Make fast/text/justify-ideograph.html more reliable

Change fast/text/justify-ideograph.html to specify a line-height and use
a web font declaration for Ahem to allow stand-alone inspection of test.

R=leviw@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197671

[eae, 2015-06-23 18:28:42]

eae@chromium.org changed reviewers:
+ leviw@chromium.org

[leviw_travelin_and_unemployed, 2015-06-23 18:41:42]

What does adding the line height get us?

Were we failing to load Ahem properly in some cases before?

[eae, 2015-06-23 19:03:39]

This test is awful and all failures I can see are due to the font not bing
loaded or the line height being wrong. This at least fixes that and allows it to
focus on what it is supposed to test.

[leviw_travelin_and_unemployed, 2015-06-23 19:59:31]

lgtm

Seems fine as a speculative fix, but if the line height part of this has any
effect on flake we have a serious problem.

[eae, 2015-06-23 20:02:00]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2015-06-23 20:02:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1196253012/1

[commit-bot: I haz the power, 2015-06-23 20:07:33]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197671