Add GL_ANGLE_memory_object_zircon_handle &
GL_ANGLE_semaphore_zircon_handle extensions to supported extensions list
and re-generate bindings.

Bug: angleproject:2475
Change-Id: I464aa402aaac916c1f459930c771a0813ec63c9b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1642333
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>