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This CL only adds a flag with parameter for enabling capping the
number of URL suggestions, and configuring the limit.

Bug: 963174
Change-Id: I5d4310cf361dc5af1df734b8ff433720eef10fc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635435
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664781}