Add Incognito Navigation histograms

Desktop / Chromium - elawrence [chromium.org] - 20 April 2017 17:26 EDT

As a part of scoping changes to behavior, we want to collect the absolute number of page navigations in Incognito mode.

BUG=712843 TEST=components_unittests --gtest_filter=NavigationMetrics*.*

Review-Url: https://codereview.chromium.org/2827983003 Cr-Commit-Position: refs/heads/master@{#466140}

16908bf Add Incognito Navigation histograms
.../navigation_metrics/navigation_metrics.cc | 9 ++++++
.../navigation_metrics_unittest.cc | 35 ++++++++++++++++++++++
tools/metrics/histograms/histograms.xml | 27 ++++++++++++++---
3 files changed, 67 insertions(+), 4 deletions(-)

Upstream: git.chromium.org


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