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Since https://chromium-review.googlesource.com/1026992 , the
pipeline now generates natural size changes correctly when the
encoded size changes.  Unfortunately, the pipeline integration tests
allowed at most one change.

This CL allows any number of size changes.

Change-Id: Id9fac03851623e45cc2cd62d2dc6e870ddc138d5
Reviewed-on: https://chromium-review.googlesource.com/1068021Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560381}