Add in test_filter to build configuration

The first "sharding" technique we will try is just by test config
(e.g. 8888, gles, etc).  Thus, for backwards compatibility,
the default "shard" is All, as in all configs

Bug: skia:
NOTRY=true
Change-Id: Ia02362477a5d97f8f74d688b5f0c4f45fc129375
Reviewed-on: https://skia-review.googlesource.com/59563
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
154 files changed