- Dynamically adjust timeline-tracks height
- Use CSS-vars for timeline view and data heights
- Introduce syncronous File.read for FireFox again
- Prepare for fixed-scaled SVG text

Bug: v8:10644
Change-Id: I3a6815df49e57eb49c55a8498ce7b8f49e5fd0ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2968945
Auto-Submit: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75237}