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Reland "Fix readPixels incorrectly allowing RGBA / UNSIGNED_SHORT without EXT_texture_norm16 support"

This is a reland of 80b096ab

The culprit was identified in Issue 1154356.

Original change's description:
> Fix readPixels incorrectly allowing RGBA / UNSIGNED_SHORT without EXT_texture_norm16 support
>
> Add readPixels validation for RGBA / UNSIGNED_SHORT combination. This is
> only valid with EXT_texture_norm16 extension enabled.
>
> Bug: 1152259
> Change-Id: I0e10b7d29f3b362c4054500270bbad87dcde599f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559797
> Commit-Queue: Shrek Shao <shrekshao@google.com>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#832141}

Bug: 1152259, 1154356
Change-Id: Ie9ceed14e705380e9d1d07f008f4ec86ea7b7421
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575048Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: James Darpinian <jdarpinian@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834348}