* change from build_runner to dart2js

* add internalBootstrapBrowserTest to some of the tests

* add internalBootstrapBrowserTest to all remaining tests

* make tests build in paralel. Total time dropped from 586 to 177 seconds for 8 core MacBook

* change isolates with pool

* fixing analysis errors

* skipping canvaskit tests for ios-safari

* copy image files to the build directory

* adding internalBootstrapBrowserTest to newly added tests

* add internalBootstrapBrowserTest to faling path iterator test

* necessary changes to make chrome windows work

* in windows test in chrome instead of edge. our edge code was for legacy edge

* do not run golden unit tests on Windows LUCI bots for now

* addressing reviewer comments. Adding a method for deciding when to run integration tests.

* remove lines that I forgot to remove

* fixing analysis error. add issue for todo

* add bootstap to a test file

* adding bootstrap to another test

* add internalBootstrapBrowserTest to a golden test

* return test result in bat file. use archieve package to unzip

* fixing logs for chrome_installer

* use archieve and archieve entity instead of dynamic

* adding comments for windows platform archieve part

* addressing reviewer comments

* change readme file

* Remap cupertino fonts to -apple-system
* Update text tests for fallback checks

* opt out dart:ui from nnbd

* Annotate tests as well

* making edge default test browser on windows. adding some skips (not all) for methods failing on edge

* skip failing tests. make egde default for testing

* skip one more test

* addressing reviewer comments. removing extra bat file

skiping tests in Safari. LUCI recipe for Mac is ready. this is the only step left for stopping us running unit tests in Safari (#16550)

* [web] Fix ParagraphRuler.hitTest

* [web] Add a test-case for paragraph.getPositionForOffset and nested TextSpans

* [web] Add a test-case for paragraph.getPositionForOffset and nested TextSpans

* [web] remove trailing spaces

* [web] avoid differences of overflow-wrap between chrome and firefox

* Enable web engine unit tests on Firefox

* addressing PR comments

* addressing PR comments

* fix the version name on the lock file

* Add Helvetica and sans-serif as fallback font families

This prevents us from using an ugly serif default font when the
requested font isn't available.

* Use Arial when not on iOS

This removes TextRange from the framework and moves it to the engine, in preparation for using it to return text ranges from the text extent APIs, like Paragraph.getWordBoundary instead of a List<int>.

Also added new tests for TextRange.

* Don't quote generic font families

This is a change that should have been upstreamed before.

* Change generic family List to a Set

* Add test

* sync Flutter Web engine to the latest

sync web engine; run web engine tests