The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0c83f6df5af844d8934d62231bbfc4b94c4b0898

commit 0c83f6df5af844d8934d62231bbfc4b94c4b0898
Author: calamity <calamity@chromium.org>
Date: Tue Aug 30 05:46:26 2016

Enable site engagement in incognito.

This CL makes the SiteEngagementService available in incognito. When in
incognito mode, the service will initialize values from the original
profile and then subsequently maintain its own independent copy.

Incognito profiles will not record periodic metrics.

BUG= 640863 
TBR=dbeam@chromium.org,rdevlin.cronin@chromium.org,dtrainor@chromium.org

Review-Url: https://codereview.chromium.org/2274973003
Cr-Commit-Position: refs/heads/master@{#415177}

[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/android/metrics/launch_metrics.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_helper.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_score.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_score.h
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_service.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_service.h
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_service_factory.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_service_factory.h
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/engagement/site_engagement_service_unittest.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/ui/extensions/application_launch.cc
[modify] https://crrev.com/0c83f6df5af844d8934d62231bbfc4b94c4b0898/chrome/browser/ui/webui/engagement/site_engagement_ui.cc