Usually Context::noopDraw would reject calls that doen't draw,
but FrameCapture::maybeCaptureDrawElementsClientData seems to be
called before Context::noopDraw, and since in ComputeTypedIndexRange
we would obtain the illegal range [0,0) (which is actually prohibited
by an ssertion "count > 0"), we have to exit early.

With that the test can be enabled.

Bug: angleproject:6111
Change-Id: I4c242712bd90602f84ad6072b02c3a13a26840f7
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2993089Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>