Treat glBeginQuery* and glEndQuery* commands the same as glDraw*
commands, generating a hierarchy.  This results in vkCmdBeginQuery and
vkCmdEndQuery commands being nested under gl*Query*, instead of being
a peer of glDraw* commands.

This change necessitated plumbing some of the existing "end" path to
return angle::Result.

Bug: b/190512191
Change-Id: I898d3fdd9b4b7d86e76dfae2ffc5d6f7316a55ef
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2950926Reviewed-by: Mark Lobodzinski <mark@lunarg.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Ian Elliott <ianelliott@google.com>