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Currently when a main SXG is served from PrefetchedSignedExchangeCache
was_in_prefetch_cache flag is set, but was_fetched_via_cache flag is not
set. So "Cached" suffixed PageLoad.Clients.SignedExchange UMAs are not
recorded.

To fix this, this CL set was_fetched_via_cache flag when we set
was_in_prefetch_cache flag.

Bug: 935267
Change-Id: I22bbd9554b871ad1f1c9e3268af113ed9c22de59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696961Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676299}