Refine sRGB support GetNonLinearFormat should return the format itself if format is non-linear. Also, for linear colorspace, sRGB render target should be supported. Bug: angleproject:377144464 Change-Id: I1179a3dbf67b619bae276e607bc61a85c1639c17 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5982242 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: mohan maiya <m.maiya@samsung.com>