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This CL adds the "HostedAppFrame.WrenchMenu.MenuAction" metric which
tracks which menu actions are being clicked from the hosted app browser
frame.

Bug: 785661
Change-Id: I4b6c349892615452ce8ed6ebc8b1c23e5f1a8a9e
Reviewed-on: https://chromium-review.googlesource.com/802838
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521273}