This unit test compares the difference in quality with
error resilience enabled and disabled. The test runs
for all of the one-pass encoding modes.

The test ensures that the effect of turning on error
resilience makes less than a 10% difference in PSNR.

Further cases should be added to do a more comprehensive
test.

Change-Id: I1fc747fc78c9459bc6c74494f4b38308dbed0c32