Add gfx unit testing framework. (#1943)

* Add gfx unit testing framework.

* Fix compilation error.

* Reset gfxDebugCallback after render_test.

* Pass enabledApi flags through.

* Fix for code review suggestions.

Co-authored-by: Yong He <yhe@nvidia.com>

2 files changed, 232 insertions, 0 deletions

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new file mode 100644
index 000000000..ee8887538
--- /dev/null
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