WebGL Conformance Test Wrapper for tex-3d-rg16f-rg-half_float.html

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

Test: ../../../../resources/webgl_test_files/conformance2/textures/image_bitmap_from_image/tex-3d-rg16f-rg-half_float.html?webglVersion=2