Add new application, called GPU-CTS (GPU Compatibility Test Suite),
which executes skia gms against OpenGL and Vulkan backends. Makes use
of googletest library for consistancy with Android CTS programs.
Add googletest to DEPS
gm_knowledge.h header as a stub for future work on validating gm output.
gm_runner can be re-used in other programs. Talks to Skia and GM with a
simple API.
gpuctx executable wraps gm_runner and googletest together.
Change-Id: Ie7350b22164fa73e44121c39b0f36da4038a700b
Reviewed-on: https://skia-review.googlesource.com/56601
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
