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This patch simply moves the location where the compressed
locale .pak files are stored within the final Chrome and
Monochrome APKs, from assets/<locale>.pak to
assets/locales/<locale>.pak

The reason to do this is to allow language-dependent
splits in the future, which will require apkbuilder.py
to support an option to place the files under a
directory like assets/locales#<lang>/<locale>.pak,
where <lang> is the language code of each corresponding
locale.

Note that these files are never accessed directly from
Chromium, instead they are extracted at startup time
if needed to the application's private data directory,
and the uncompressed file there is what Chrome will
later memory-map from native code.

In detail:

- Modify chrome/android/BUILD.gn to ensure that the
  compressed locale pak files are placed under
  assets/locales/

- Modify write_build_config.py to not use the directory
  of locale pak files when generating the Java locale
  lists for COMPRESSED_LOCALES and UNCOMPRESSED_LOCALES.

- Modify ResourceBundle.java to deal with the new list
  format when looking for uncompressed locales.

- Modify ResourceExtractor.java to deal with the new
  list format and the new locations.

BUG=820459
R=agrieve@chromium.org,dtrainor@chromium.org,tedchoc@chromium.org

Change-Id: Ia0caef3514a1ccfa72fe0ab1ff6fc1bf418377a6
Reviewed-on: https://chromium-review.googlesource.com/1010352
Commit-Queue: David Turner <digit@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551332}