Revert "Update Android Apps to use gradle"

This reverts commit 425535f1626932e4e22f61a2571f9c3c2b1c5977.

NOTRY=true
NOTREECHECKS=true
TBR=djsollen@google.com
BUG=skia:
DOCS_PREVIEW= https://skia.org/?cl=1250233002

Review URL: https://codereview.chromium.org/1250233002
30 files changed