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During startup lots of tiny tasks are posted by FieldTrialSynchronizer.
Individually they are not a problem but on low end devices it can take
60+ ms to process all of these. This patch significantly reduces the
number of tasks posted.

Change-Id: I1d0bff3386cfb308c27641f90189aae2071a5fe0
BUG: 1013535
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849852Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Auto-Submit: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720908}