extension XML cleanup Add a bunch of missing extensions, commands, enums, and aliases to the extension XML files. These were missing when I generated a GL loader from the XML. Additionally, removing the unimplemented ANGLE_timer_query specification. Bug: angleproject:8432 Change-Id: I55b7393a313070719200c150a91b1751206ca2cb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5347156 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Auto-Submit: Steven Noonan <steven@uplinklabs.net> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>