[tor-bugs] #30832 [Applications/Tor Browser]: Fix tor-browser tbb-tests

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#30832: Fix tor-browser tbb-tests
--------------------------------------+---------------------------
 Reporter:  acat                      |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  ReleaseTrainMigration     |  Actual Points:  2
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:  Sponsor58
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Changes (by acat):

 * actualpoints:   => 2


Comment:

 This took longer than expected.

 Here is a branch with 6 fixups for tests: https://github.com/acatarineu
 /tor-browser/commits/30832.

 * f5202200d1ecdc56f0437f83210cb292ae40559e: the old <script> tags were not
 working, and I had to set a targetOrigin of one `postMessage` to `*`,
 otherwise it would complain about target being a different origin.
 * c817518a544e1fada4a55f9ad3a064ed433ba90c: these are already tested in
 tbb-testsuite, so leaving just a few just to check that our prefs file is
 applied. Also removed a couple of files in `tbb-tests/browser.ini` which
 still do not exist at this point.
 * 581241ecfd605045561a73b648d1f3e017008c01: update to new async API and
 add test to browser.ini.
 * f452d6bbc04fc891b05a99173edaf408674b0012: update APIs and add test to
 browser.ini.
 * c73bfe7f3b21421c7349267f2abac9f90f503b73: we need `layout.css.line-
 height.normal-as-resolved-value.enabled = false`, otherwise `line-height`
 property is read as `normal` and we cannot get the number in pixels. Also
 found that I needed to apply a `Math.round` to the read `fontSize`,
 otherwise the calculated values would not match.
 * 2e845b4c67ab78ca5096fd67fb9c031af9a34aac: ignoring onboarding tests,
 changed logic for getting the starting commit in `run-tbb-tests` and added
 a few necessary prefs.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30832#comment:5>
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