Add a DDL Skpbench bot

This adds a 9 threads 3x3 grid of tiles DDL SKPBench bot that reports the total time. We will
eventually want a 4x4 bot, a 1x1 bot and a 0x1 bot. Additionally, we will want another whole set
that only emits the DDL record time.

So the ultimate naming scheme would be:
DDLTotal_9x9   DDLRecord_9x9
DDLTotal_4x4   DDLRecord_4x4
DDLTotal_1x1   DDLRecord_1x1
DDLTotal_0x1

Change-Id: Ia96c79ec05602077f4112c69cb344bd8c9b2b4b1
Reviewed-on: https://skia-review.googlesource.com/130923
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
5 files changed