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Util method LogSignificantUserEvent() will log timestamps of user actions
deemed indicative of users that would want Chrome as their default
browser. The user actions in this CL are Extension Actions, searches
from copied clipboard content, and GrowthKit opens.

Bug: 1107489
Change-Id: If5f24100352a60362c35044feabf9fdc7b29f2ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330931
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795614}