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The limit of this implementation is unintentional launch, e.g user click
some notification and go to external activity and then go back, it will
also be counted. Solution is create a histogram of launch type, if majority
if launches come from hitting Chrome icon, then the noise have less impact
to the accuracy of daily launch count histogram.

Bug: 806240
Change-Id: Iec367758267bba806b4ed2c34c9e030e0ec65909
Reviewed-on: https://chromium-review.googlesource.com/1103838Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Charlie Ma <charliema@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576108}