Revert "Revert "Android: Store language .pak files in res/raw rather than assets""

This reverts commit bd0057ca4ca5990173e099f5cdd5219c6ed72fd5.
Also adds a "setMandatoryPaksToExtract" overload to prevent breakage.

BUG=371610
TBR=Yaron, Torne, cjhopman, Jaekyun Seok, James Hawkins, gunsch, newt

Review URL: https://codereview.chromium.org/1198193006

Cr-Commit-Position: refs/heads/master@{#335538}
16 files changed