[Offline indicator v2] Separate top and bottom controls ratios

This CL adds the plumbing to have separate top and bottom shown ratios.
Having separate ratios is required for the upcoming CLs as we
ultimately want to be able to animate the top and the bottom controls
independently.

Bug: 989148
Change-Id: I874cf7f6fa0380cb9a1497d3804969b82bd419c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827951
Commit-Queue: Sinan Sahin <[email protected]>
Reviewed-by: Philip Rogers <[email protected]>
Reviewed-by: David Bokan <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Will Harris <[email protected]>
Reviewed-by: Khushal <[email protected]>
Reviewed-by: Matthew Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#708781}
47 files changed