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Originally, we pruned Android's fork to remove files which are not
needed by Android, and may be a distraction from the files which
matter.

We decided to include all of the files (to simplify merging), so
add a README.android to tell users to ignore the extraneous files.

BUG:http://skbug.com/2416
Change-Id: Ib34f355962f5e8b9a2eca6e9b9952baa277ca166