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Most service workers will need CacheStoragePtr in a performance
sensitive way. We discovered there is slowness using InterfaceProvider
to get the ptr on first use after worker startup.

Bug: 854905
Change-Id: Iefcd8910d1b8b6ba1cfcc4df79c213abde0f9e3a
Reviewed-on: https://chromium-review.googlesource.com/1124130
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572544}