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This CL adds a feature pod button for Bluetooth. By clicking on the
button, it will show bluetooth detailed view of the existing SystemTray.
This behavior is described as Development Stage 1 in the design doc:
go/cros-qs-restyling

TEST=manual
BUG=813499

Change-Id: I130301b9a25d31a520b1a0bb8f78839aa4b91b73
Reviewed-on: https://chromium-review.googlesource.com/948164
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542067}