Refactor ANGLE Extensions Validation Refactors ANGLE Extensions Validation functions into a common format for future autogeneration. Any writes to output parameters that occurred within the ANGLE entry point have been moved into the corresponding validation function. Bug:angleproject:2263 Change-Id: I7a678310ad481c1379596a493fcb0b0383fcf3b8 Reviewed-on: https://chromium-review.googlesource.com/985244 Commit-Queue: Brandon1 Jones <brandon1.jones@intel.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>