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

Screenshot: http://screen/scc32RkykN2

TEST=manual
BUG=821671

Change-Id: I156db2af966d13082079e639e2c46805b0453995
Reviewed-on: https://chromium-review.googlesource.com/961748
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543640}