cc: Fix flaky RSLLMembershipWithScale test

Update this test to reflect the removal of twin updating.  Instead of
having tilings removed, tilings currently just stay stale if their
layer owner is not in the RSLL and updated.

The test was going to the next step before a pinch was complete, and so
would sometimes end up with an extra draw from source frame 0 before
the commit from source frame 1 would occur.  This is easily repro'd by
adding a sleep(1) to the draw function in the test.

This is avoided by tracking NotifyReadyToDraw and only going to step #2
after the draw following it.

R=danakj@chromium.org,vmpstr@chromium.org
BUG=460581
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1276683002

Cr-Commit-Position: refs/heads/master@{#342158}

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