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In order to contain the newer timing information, net::LoadTimingInfo::ServiceWorkerTiming is defined and contained in net::LoadTimingInfo. Of course this struct is widely used, so is this okey? or is there some another solution?

1st patch: https://codereview.chromium.org/515583005/

BUG=401389
TEST=N/A

Review URL: https://codereview.chromium.org/515753003

Cr-Commit-Position: refs/heads/master@{#295635}