GitLab

crrev.com/c/1681309 accidentally enabled
SignedExchangePrefetchCacheForNavigations feature. Prefetched SXGs are stored to
PrefetchedSignedExchangeCache even if both
SignedExchangePrefetchCacheForNavigations and SignedExchangeSubresourcePrefetch
are disabled. This is unintentional. Prefetched SXGs should no be stored to the
cache. This CL fix this.

SignedExchangePrefetchCacheForNavigations feature can be enabled only by flags.
But SignedExchangeSubresourcePrefetch feature can be enabled by both flags and
OriginTrial token which is checked in the renderer process.
So we need |is_signed_exchange_prefetch_cache_enabled| flag in ResourceRequest
to let the PrefetchURLLoader in the browser process whether the prefetched SXG
should be stored to PrefetchedSignedExchangeCache.

This CL adds the flag in blink::FetchParameters, blink::ResourceRequest,
bink::WebURLRequest, network::ResourceRequest and network::mojom::URLRequest,
and sets the flag in PreloadHelper::PrefetchIfNeeded() if
SignedExchangePrefetchCacheForNavigations feature or
SignedExchangeSubresourcePrefetch feature is enabled.

Change-Id: I719dbbd1093e05c30b6b0075ad87f56289f00ac7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703687Reviewed-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@{#678545}