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This CL is based on wbjacksonjr@'s proposal. Currently, all prefetch triggers have a concept of referring document/origin. Specifically, potential value of PrefetchContainer::referring_origin_ is - If CCT (prefetch from App A that has verified associated origin): referring_origin == A’s origin - If CCT (otherwise): referring_origin == opaque origin [1] so that we can treat this request as a cross-site prefetch. Also, if nullopt is passed to PrefetchContainer's public ctor for browser- initiated prefetch, it is automatically converted to opaque origin [2] - If Speculation rules prefetch in document A: referring_origin == A’s origin In order to introduce WebView prefetch, which has no concepts that corresponds to referring document/origin and thus has no restriction related to it, this CL changes the type of PrefetchContainer::referring_origin_ to std::optional so that general browser-initiated prefetch can use this. Practically this case can be handled like same-site prefetch, in the same manner as normal browser-initiated prerender behaves like same-site prerender. [1] https://source.chromium.org/chromium/chromium/src/+/main:chrome/android/java/src/org/chromium/chrome/browser/WarmupManager.java;l=663;drc=8f3124aee72eb5cc75bec53fd9e7999592767e9a [2] https://source.chromium.org/chromium/chromium/src/+/main:content/browser/preloading/prefetch/prefetch_container.cc;l=426;drc=4d3dad034f8aefd3a1c6043eecbd901568546936 Bug: 40946257, 363946909 Co-authored-by: Wayne Jackson Jr. <wbjacksonjr@chromium.org> Change-Id: Ic0d1bf1e3350c719020a6a9b8232a50acc170ab4 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5942243 Reviewed-by: Wayne Jackson Jr. <wbjacksonjr@chromium.org> Reviewed-by: Kouhei Ueno <kouhei@chromium.org> Commit-Queue: Kouhei Ueno <kouhei@chromium.org> Cr-Commit-Position: refs/heads/main@{#1373194}
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