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Per UI review, the TTS settings page sliders should have their current
values shown on the screen and dots showing that they have steps, similar
to the slider in the display settings page.

Bug: 823359
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9a52d25c11a95439f90e767a02744c162f693605
Reviewed-on: https://chromium-review.googlesource.com/1054558
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559320}