Verify renderbuffers are initialized to 0 before being read in WebGL

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

Test whether the WebGL internal buffers have been initialized to 0.
PASS Buffers have been initialized to 0.
Test whether user created buffers have been initialized to 0.
PASS Buffers have been initialized to 0.
Test whether the WebGL internal buffers have been initialized to 0.
PASS Buffers have been initialized to 0.
Test whether user created buffers have been initialized to 0.
PASS Buffers have been initialized to 0.
PASS clearColor is [1, 0, 0, 1]
PASS successfullyParsed is true

TEST COMPLETE