Closes https://github.com/flutter/flutter/issues/66006.
From what I can tell in the multi-view effort a variation of
https://github.com/flutter/flutter/pull/88609 already landed, meaning
that the current device-pixel-ratio is being used (as the tests in
#88609 are now passing), and I believe that means we can remove the
override/hack.
Will rely on "Google Testing" to run a TGP internally, or do so myself
if necessary.
* Adds support for `flutter test --wasm`.
* The test compilation flow is a bit different now, so that it supports compilers other than DDC. Specifically, when we run a set of unit tests, we generate a "switchboard" main function that imports each unit test and runs the main function for a specific one based off of a value set by the JS bootstrapping code. This way, there is one compile step and the same compile output is invoked for each unit test file.
* Also, removes all references to `dart:html` from flutter/flutter.
* Adds CI steps for running the framework unit tests with dart2wasm+skwasm
* These steps are marked as `bringup: true`, so we don't know what kind of failures they will result in. Any failures they have will not block the tree at all yet while we're still in `bringup: true`. Once this PR is merged, I plan on looking at any failures and either fixing them or disabling them so we can get these CI steps running on presubmit.
This fixes https://github.com/flutter/flutter/issues/126692
Syncs our lints with https://github.com/dart-lang/linter/blob/master/example/all.yaml:
* removed the deprecated `iterable_contains_unrelated_type` and `list_remove_unrelated_type` lints (their replacement `collection_methods_unrelated_type` was already enabled for us)
* enabled the new `no_self_assignments` and fixed one issue triggered by the lint.
This PR includes an updated test case for integration_test and a new test case for flutter_test to ensure that hit tests transform properly when using setSurfaceSize, for both the IntegrationTestWidgetsFlutterBinding and LiveTestWidgetsFlutterBinding bindings.
