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Creating histograms for roam time for FT and non-FT networks and for
PSK and 802.1X authentication. This is a success metric to quantify
roaming time improvements from FT. Histograms are implemented in
CL:957442

Bug: 791202
Change-Id: I0afed4ef74080d32b24088cc34636ead1367e5b4
Reviewed-on: https://chromium-review.googlesource.com/957703
Commit-Queue: Matthew Wang <matthewmwang@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549401}