In the case there are any dirty inactive attributes, we were
continually invalidating the Vertex Buffer and Input Layout
bindings. This fixes the invalidation to only happen when
there are any dirty active attributes.

This regressed in "Move Buffer Subject/Observer to front end."

Bug: chromium:829906
Bug: angleproject:2389
Change-Id: I8ed616bb696e0be548344192037ad6cc6f9c595c
Reviewed-on: https://chromium-review.googlesource.com/1006998Reviewed-by: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>