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Previously, settings button for volume slider was hidden when volume
slider was shown as a single row bubble, not in a main bubble.

This CL changes the settings button to be always shown. When the button
is clicked in the slider bubble, it will open the main bubble.

TEST=manual
BUG=870473

Change-Id: Icc5b3d528414ee49ce6f0ffb4f4d47c0ce69c9ec
Reviewed-on: https://chromium-review.googlesource.com/1170667
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582486}