This test runs the WebGL Test listed below in an iframe and reports PASS or FAIL.

Test: ../../../../resources/webgl_test_files/deqp/functional/gles3/uniformbuffers/single_struct.html
[ 1: FAIL ] ubo.single_struct.per_block_buffer.std140_vertex: Assert failed
[ 2: FAIL ] ubo.single_struct.per_block_buffer.std140_fragment: Assert failed
[ 3: FAIL ] ubo.single_struct.per_block_buffer.std140_both: Assert failed
[ 4: FAIL ] ubo.single_struct.per_block_buffer.std140_instance_array_vertex: Assert failed
[ 5: FAIL ] ubo.single_struct.per_block_buffer.std140_instance_array_fragment: Assert failed
[ 6: FAIL ] ubo.single_struct.per_block_buffer.std140_instance_array_both: Assert failed
[ 7: FAIL ] ubo.single_struct.single_buffer.std140_instance_array_vertex: Assert failed
[ 8: FAIL ] ubo.single_struct.single_buffer.std140_instance_array_fragment: Assert failed
[ 9: FAIL ] ubo.single_struct.single_buffer.std140_instance_array_both: Assert failed
[ 10: PASS ] ubo.single_struct.single_buffer.std140_instance_array_both: successfullyParsed is true
[ FAIL ] 9 failures reported