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MediaRouter.Dial.CreateRoute - records result of a CreateRoute call.
MediaRouter.Dial.TerminateRoute - similarly for a TerminateRoute call.
MediaRouter.Dial.ParseMessage - records result of parsing a message
coming from the Cast SDK.
MediaRouter.Dial.FetchAppInfo - records reuslt of a app info request.
Note we already have metrics for device description.

Bug: 808720,798861
Change-Id: Ic48eba338298e7086fcab290f24ab490e5944ab3
Reviewed-on: https://chromium-review.googlesource.com/1153648Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580575}