Implement hanja counter styles

Implement hanja counter styles
    
Implement both the formal and informal hanja counter style.
The patch follows the korean specific steps in the algorithm
for extended counter styles [1].

Add the corresponding tests from the official test repository [2].

Behavior matches Firefox.

[1] http://www.w3.org/TR/2013/WD-css-counter-styles-3-20130718/#extended-cjk    
[2] https://github.com/w3c/csswg-test/tree/master/css-counter-styles-3/i18n

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197870

[rwlbuis, 2015-06-25 22:18:17]

rob.buis@samsung.com changed reviewers:
+ kojii@chromium.org, tkent@chromium.org

[rwlbuis, 2015-06-25 22:18:18]

PTAL. Note that I think it may be suitable if one of you could add the japanese
counter styles :)

[tkent, 2015-06-25 23:22:12]

The CQ bit was checked by tkent@chromium.org

[tkent, 2015-06-25 23:22:12]

lgtm

[commit-bot: I haz the power, 2015-06-25 23:22:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1210903004/30001

[commit-bot: I haz the power, 2015-06-26 00:09:20]

Committed patchset #3 (id:30001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197870