This also includes support for compressed formats, which
required a small refactor to streamline the code, since all
of the entrypoints have slightly different parameter lists
for imageSize and data.

Bug: angleproject:3662
Test: Working through Manhattan frames 5-10, TRex still works
Change-Id: I007ad9366934fff773f367ecb6387bc8b0d13aa0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2039530
Commit-Queue: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>