When locale fallback landed, resources which specified an 'English'
locale started to be considered a better match for en-US, even though
traditionally, apps tend to ship US English resources under their
default locale.
This fixes that, and makes en-US requests match default locales.
Bug: 26756573
Bug: 26789680
Bug: 26803868
Change-Id: I460c276bfc6ddba0439dcdf87497a0aece0fa05d
* Add support for determining script from language and region.
* Add support for determining special parents of locales.
* Add support for smart comparison of locales with only a difference
in region, using the locale parentage tree.
* Fix LocaleData.matchScore() to not fallback to old locale matching
behavior if we can't determine a script.
* Allow four-character variant codes. (Previously, only five- to
eight-character variant codes were allowed.)
Bug: 7296673
Bug: 26589793
Change-Id: Ibde0a48c0564ff383b41068095a5cbacfe7b94bc
