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This is done by adding a new |enable_language_splits| variable to
the android_app_bundle GN template. Note that splitting by
screen_density or ABI currently doesn't make sense for Chromium,
but could be added in the future.

Only the chrome_public_bundle target uses language-based
splits in this CL.

BUG=846633,820459
R=agrieve@chromium.org, yfriedman@chromium.org
TBR=twellington@chromium.org,tedchoc@chromium.org

Change-Id: Ic89f9dd4b8c78e8b2127bb19208db18bc8027eab
Reviewed-on: https://chromium-review.googlesource.com/1125934
Commit-Queue: David Turner <digit@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574888}