This parses the dEQP test name into a GoogleTest-friendly gtest_filter
automatically. This makes pasting in test case names from the
expectations file more straight-forward.

Bug: angleproject:2557
Change-Id: Ib5fbb46ad487a89352d728aebedc1752ddb0673d
Reviewed-on: https://chromium-review.googlesource.com/1058252
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>