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Based on some example campaigns for which chrome sync history won't be
useful, extend the maximum number of gestures in a referrer chain to
5 gestures. We can then evaluate how useful the extra data is, and
possible extend the maximum gestures for all users.

Bug: 864266
Change-Id: Idbcc2e07f7593a90f05ba07a2e1ef0c2a1be757b
Reviewed-on: https://chromium-review.googlesource.com/c/1287041
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600883}