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This test makes assumptions about ordering of different task sources
that are not guaranteed by either the spec or the implementation.

Bug: 784909
Change-Id: I6c5d25fd5c684594ca272a84a664692c90caff6e
Reviewed-on: https://chromium-review.googlesource.com/896034
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534179}