Add //build/android/pylib/results/ to Android isolate packaging

This is needed before relanding
https://chromium-review.googlesource.com/c/chromium/tools/build/+/619228

TESTED=
I built tools_unittests and verified build/android/pylib/results/presentation/test_results_presentation.py
is listed in the .isolated file:
OUT=out/android-Release
TEST=tools_unittests
tools_webrtc/mb/mb.py isolate //$OUT $TEST
tools/swarming_client/isolate.py archive -I https://isolateserver.appspot.com -i $OUT/$TEST.isolate -s $OUT/$TEST.isolated

BUG=chromium:717417
NOTRY=True

Review-Url: https://codereview.webrtc.org/3006103002
Cr-Original-Commit-Position: refs/heads/master@{#19695}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f8ff0282c6b605f16fa5464b9496be1f6bac35ed
1 file changed