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Up until now, each in-product help feature has recorded their own
histogram for how often they are triggered. However, this makes it
hard to inspect the overall data for how often in-product help is
triggered in general.

This CL therefore adds a new histogram that is triggered regardless of
which feature invoked it: InProductHelp.ShouldTriggerHelpUI. That name
is also the base name for the suffix-based feature specific histograms.

In addition, tests are added to ensure these histograms behave as
expected.

BUG=733799

Change-Id: I9c99494dc64f9c20fc2e811d7596ff0d7a7f72c2
Reviewed-on: https://chromium-review.googlesource.com/569259
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Alexei Svitkine (slow) <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486942}