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GL_REQUIRED_TEXTURE_IMAGE_UNITS_OES is a "get"-only enum, so even though
it may be accepted by the texture_paramter validator (which has both
"set" and "get" enums, as they are mostly the same), we need to handle
it in Texture::SetParameter* and return GL_INVALID_ENUM.
Some enums (e.g. GL_TEXTURE_SRGB_DECODE_EXT) were only handled in

Texture::SetParameteri, so rework this a bit so that SetParameterf
always delegates everything (including error cases) to SetParameteri,
except for float params (which are only a handful), to avoid most of the
duplication.

Bug: 877754
Change-Id: I15c52f81e62544f90a15b914113c5c4816530cdb
Reviewed-on: https://chromium-review.googlesource.com/c/1343357Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609492}