SearchPrefetch: Add UMA for CacheAliasSearchPrefetchURLLoader This CL adds following UMAs (see histograms.xml for details): - Omnibox.SearchPrefetch.CacheAliasElapsedTimeToFallback - Omnibox.SearchPrefetch.CacheAliasFallbackReason These should be useful for understanding fallback reasons and penalty of fallback. Bug: 353628436 Change-Id: I6d4489336dd3567a26e1f247ecb3fd507602b9c6 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5821094 Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org> Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org> Cr-Commit-Position: refs/heads/main@{#1349555}
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