LuminanceWorkaroundTextureSwizzleBug test bug fix This test would create an sRGB format texture without checking for the GL_EXT_texture_sRGB extension. Skip the test if it is not supported. Bug: angleproject:5281 Change-Id: I491e874201c26c9f828772a0fbebaea307ab57a0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2519865 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>