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Add unit tests for install In-Product Help recording and triggering
functions.

Bug: 1149670
Change-Id: Ibb91438b6a12787b9eac6794ab8747bd13136009
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545782Reviewed-by: Phillis Tang <phillis@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Phillis Tang <phillis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834970}