Balance debuglabel begin/end pairs for skipped drawcalls 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/+/2895330 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Ian Elliott <ianelliott@google.com> Commit-Queue: Ian Elliott <ianelliott@google.com>