Add support for compressed GPU memory buffers.

This CL adds support for compressed GPU buffer formats.

BUG=434699

Committed: https://crrev.com/3113db1250a2687c030585f6045f2ef242b98db6
Cr-Commit-Position: refs/heads/master@{#317765}

Review URL: https://codereview.chromium.org/916083002

Cr-Commit-Position: refs/heads/master@{#318004}
20 files changed