The test suite occasionally runs into the following error:

[02036.794449][326733][326738][klog] INFO: [ERROR:src/ui/scenic/lib/scenic/session.cc(412)] Scenic session error (session_id: 1): Present2() called with no more present calls allowed. Terminating session.

This is actually a problem with the test harness as resetting the window
triggers a present with no fences and no OnFramePresentedCallback which
means there is no way to know if we will exceed the limit.

Add an OnFramePresentedCallback and count presents to stay under the
limit. This blocks if there's more than 2 in flight presents. A dedicated
async loop is used to avoid re-entering other code while waiting to
present (there is no such case in the ANGLE test suite currently, but
better safe than sorry).

Typically if we run the whole suite there will be a failure in the
middle, but re-trying the test that failed won't repro the issue. Add a
test that reliably exhausts the limit by calling resetNativeWindow() in a
loop.

Bug: angleproject:4360
Change-Id: I24eb01fd72fc0be57c36e49b5875023a80d6ab91
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2027934
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>