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Adds the Getaway UI to showcase for convenient debugging/iteration.
Improves the UI per new mocks. Capitalizes an existing string (no need
to re-translate, only capitalization in En-US changed).
Makes the blur less transparent by adding a black semi-transparent view
below it.

Bug: none
Change-Id: I69f9fb932b210143780a9be736201daa6be0a689
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602418
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840212}