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This CL introduces PrefetchedSignedExchangeInfo struct, which keeps the
information about a prefetched signed exchange. It is created in
PrefetchedSignedExchangeCache and passed to SubresourceLoaderParams and will be
passed to the renderer process in CommitNavigation IPC's CommitNavigationParams.

Bug: 935267
Change-Id: Id67c2ce99801f6c89d679cf9efaf65617d68cdfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600438Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659318}