add tiger tests

Add the tiger test suite.

In extended mode (-x) this
adds 700K new pathop tests.

Normally, it adds about 3500
tests.

TBR=reed@google.com
BUG=skia:5131
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2373533002

Review-Url: https://codereview.chromium.org/2373533002
3 files changed