WebGL: Update TexImageHelperCanvasRenderingContextHost

Update TexImageHelperCanvasRenderingContextHost to use TexImageParams.

Add macros to populate TexImageParams, and replace all instances of
populating TexImageParams with the macros.

Bug: 1310814
Change-Id: I8771129dc9c6c022598654c5b92ecf3ac5c0aefd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3575681
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: ccameron chromium <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/main@{#990721}