1. ast,an,wa locale data (minimal)
   - make up the minimal locale data for 3 languages.
   - update source/data/{locale,lang}/reslocal.mk to have 3 languages
   - update scripts/data_file_to_preserve.txt to have files for 3 locales
     listed.
   - In chromium, these languages have to be added to the A-L list to show
     up in the A-L pull-down in settings.

2. IANA timezone db updte to 2016a
  See http://mm.icann.org/pipermail/tz-announce/2016-January/000035.html
  for the change.

3. Pre-built-data files are updated.

Data (icudtl.dat) size changes between 54.1 and 56.1
  non-Android platforms: 10,124,096 bytes (net change: -83,840)
  Android: 6,560,080 bytes (net change: +291,840 / 4.66%)

BUG=575007,474333
R=jsbell@chromium.org

Review URL: https://codereview.chromium.org/1665113004 .