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This implements the new progress bar design for touchless.

Screenshot of this implementation: http://crbug.com/958184#c21
Mock: https://docs.google.com/presentation/d/1c-aVSZ_zsBuzCwQ4CrBJppmRQjiupa6PXmlC2OS-F-Q/edit?hl=en#slide=id.g5a1bc6d2c5_1_0

Bug: 958069,958184
Change-Id: I0b21876379036cd4aba3105c35345e187275a60c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628869
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664927}