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This CL adds code to the PhishingClassifier to extract a screenshot of
the current page. It also sends this screenshot to the Scorer to
determine if the visual model matches the given screenshot.

Bug: 1068617
Change-Id: I9e4cb1ba8888fa76b116405611bf64280a87def0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226974Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775835}