WebGL texture clear conformance test.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

TEST COMPLETE: 3 PASS, 1 FAIL

PASS getError was expected value: NO_ERROR : Should be no errors from setup.
FAIL should be green at (0, 0) expected: 0,255,0,255 was 0,0,0,0
PASS getError was expected value: NO_ERROR : Should be no errors from setup.
PASS successfullyParsed is true

TEST COMPLETE