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This new histogram allows us to know why a navigation ended up being
intercept or why it didn't. It'll help us understand how often users get
into apps as well as how often users get into websites for which they
have an app installed.

Bug: 785661
Change-Id: I2668f34421958b88885f53113b82a391777d9f36
Reviewed-on: https://chromium-review.googlesource.com/798250
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522025}