[simple_browser] Tab Rearrangement (2/4)

- Implement the presentation part of the tab rearrangement for the
non-scrollable tab list (fxb/45237)
- Fixed the broken textstyle issue in tabs_widget_test.dart (fxb/45720)
- Added widget tests for tab rearrangement
- Removed the widget test for TabsWidget that is not applicable anymore.
- Design doc: https://docs.google.com/document/d/1MUEbx9lvaI5SLZz_cZLSLV9PSo0xY1845qSkQj6oqIw/edit#heading=h.mhfj5ekqrn7l
- Demo: https://drive.google.com/a/google.com/file/d/1c8G88rhlF2sXzdfmyfOETvCsvcs230ex/view?usp=sharing

Change-Id: I3df9ce3e6e3fa51a2eccd4582bd2fa636b1842e7
3 files changed
tree: 3d1bbf9184942bddf090da567103de1be63b3ed7
  1. base_shells/
  2. benchmarks/
  3. bin/
  4. examples/
  5. lib/
  6. session_shells/
  7. settings/
  8. story_shells/
  9. tests/
  10. .gitignore
  11. analysis_options.yaml
  12. AUTHORS
  13. BUILD.gn
  14. CONTRIBUTING.md
  15. LICENSE
  16. OWNERS
  17. PATENTS
  18. README.md
README.md

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