To match the parameter order of MultiDraw* calls.
And potentially expose in chromium directly with ANGLE_ prefix.

Bug: angleproject:3402, chromium:891861
Change-Id: I19548f4c3c7faa422e43905850b218039de43015
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1894241
Commit-Queue: Shrek Shao <shrekshao@google.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>