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This adds integration tests for real-time Safe Browsing checks.

In order to test real-time lookups without making network
requests to Safe Browsing servers, this adds a
"--mark_as_real_time_phishing" command-line flag for
treating a given URL as unsafe. This works by adding an unsafe
verdict for this URL to VerdictCacheManager. This also adds
a "--mark_as_allowed" command-line flag for treating a URL
as safe according to the allowlist used by real-time lookups.

Bug: 1111414
Change-Id: Id72c6a4f4ffe2186a71e680b34df9a1c4d0a7a59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357553
Commit-Queue: Ali Juma <ajuma@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800733}