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This CL makes the integration tests more robust by waiting for a
pre-specified number of entities. This is a speculative fix for the
referred bug / a further step in understanding the actual root cause.

Bug: 997629
Change-Id: I74a3e7c0d2dba9a3d63664887c4d5d3e3b4b25c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022712
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735796}