Some drawcalls may be no-op'd due to shader issues or having
zero instance or element counts. In these cases, the ANGLE markers
used for AGI will become imbalanced as it is the drawcalls that
trigger the 'begin' marker. This patch ensures that the dirty-bit
draw event handler is called for no-op'd drawcalls to keep the
AGI commandTree in balance.

Bug: b/184888395
Change-Id: I1041d2f06fb313934365340c35e458bc5a66ba64
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2895330Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>