More LayoutLocale refactor with additional Chinese support
Following the initial LayoutLocale refactoring CL[1], this patch:
1. Support 14 encompassed languages within the Chinese macrolanguage[2].
2. Add "mo" (Macau) as "Traditional by default", as pointed out by W3C
I18N WG and match to Firefox.
3. Better and more spec conformance to parse BCP-47 language tags[3].
4. Change "und-Zsye" (Emoji) priority from the lowest to the highest.
5. Unify the logic for disambiguation of the Unified Han Ideographs for
Linux/Android and Windows.
6. Merge duplicated code in AcceptLanguagesResolver to LayoutLocale.
7. Centralize locale-related methods more to LayoutLocale for better
discoverability, caching, and code sharing.
[1] https://codereview.chromium.org/2161683002
[2] http://www-01.sil.org/iso639-3/documentation.asp?id=zho
[3] https://tools.ietf.org/html/bcp47
BUG=586517, 611817
Review-Url: https://codereview.chromium.org/2192703002
Cr-Commit-Position: refs/heads/master@{#409157}
14 files changed
