samrobinson eeba63ab3e Add MssimCalculatorTest to verify SSIM calculations.
As part of this change, MssimCalculator is moved from androidTest/ to main/

PiperOrigin-RevId: 473771344
(cherry picked from commit 8ce42f0670504a89c5c3e546f8be3d849be36195)
2022-09-12 16:45:36 +00:00
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