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PageAutoFetcher isn't yet used, but it is fully functional. It schedules
requests and cancels scheduled requests, and uses a new client policy.

Note PageAutoFetcher isn't yet called anywhere.

Bug: 883486
Change-Id: If1f9ed401e30466d6c55f7598477150feb983f27
Reviewed-on: https://chromium-review.googlesource.com/c/1234358Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Dan H <harringtond@google.com>
Cr-Commit-Position: refs/heads/master@{#601363}