OpenXR src_overrides

This folder is intended to contain forked files of changes that we have made to openxr files. The goal should be to eventually upstream these changes.

patches/ contains .patch files generated via git format-patch and should be generated based off of commits that only have changes to the src_overrides file and should be generated after the file is forked. Sequential ordering should be maintained (renaming the leading number if needed). Patches and files should be removed when they no longer need to be forked due to consuming an upstreamed version of the change. After a roll, the new version of the files can be copied into src_overrides and the patches can be applied via git am. If there are merge conflicts, patches should be re-exported, with care taken to try to maintain only one upstreamable change per patch.

//third_party/openxr/fork_overrides.py can help with "resetting" the state of the override files to give a clean attempt to try to run git am src_overrides/patches/* before either making new changes for the patches, or simply for a roll. Note that descriptions of changes going into src_overrides should be made in //third_party/openxr/README.chromium.