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This CL introduces PublicResourceDecider interface that has the redirect
decision making API that subclasses should implemeent. This class also
has the mojo interface got interacting with browser process. This
interface also has the RedirectResult enum that will have ineligible
reasons for public image hints approach and robots checking based
approach.

PublicImageHintsDeciderAgent (rename of SubresourceRedirectHintsAgent)
is introduced which is the subclass of the decider interface for public
image hints approach.

Change-Id: I5ef43c2ee821f7d5aa6501683c22e09464da7972
Bug: 1152527
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572755
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834888}