The chunked_texture_upload splits texture uploads for glTexSubImage
calls but ANGLE uses glTexSubImage internally for robust resource
initialization. Also chunk those uploads.

Bug: chromium:1181068
Change-Id: Ia6eaac8117173946630f420b396cbc54c163b7ce
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2961230Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>