Check in autogenerated GL bindings

a) These rarely change (really only when you modify the functions)
b) It's easier to review the actual changes to the code when
bindings are updated

Review URL: https://codereview.chromium.org/851663003

Cr-Commit-Position: refs/heads/master@{#311610}
24 files changed