Changes to original CL: The code that issues an error on unsupported
operating system in the dry-run case was missing a case for iOS and
Android
Original CL description
tl;dr Removes 50% (>1650 locs) of native asset related code in
`packages/flutter_tools`
Before this PR the invocation of dart build/link/dry-run was implemented
per OS. This lead to very large code duplication of almost identical,
but slightly different code. It also led to similarly duplicated test
code.
Almost the entire dart build/link/dry-run implementation is identical
across OSes. There's small variations:
- configuration of the build (e.g. android/macos/ios version, ios sdk,
...)
- determining target locations & copying the final shared libraries
This PR unifies the implementation by reducing the code to basically two
main functions:
* `runFlutterSpecificDartBuild` which is responsible for
- obtain flutter configuration
- perform dart build (& link)
- determine target location & install binaries
* `runFlutterSpecificDartDryRunOnPlatforms` which is responsible for a
similar (but not same):
- obtain flutter configuration
- perform dart dry run
- determine target location
these two functions will call out to helpers for the OS specific
functionality:
* `_assetTargetLocationsForOS` for determining the location of the code
assets
* `_copyNativeCodeAssetsForOS` for copying the code assets (and possibly
overriting the install name, etc)
=> Since we get rid of the code duplication across OSes and have only a
single code path for the build/link/dry-run, we can also remove the
duplicated tests that were pretty much identical across OSes.
We also harden the building code by adding asserts, e.g.
* the dry fun functionality should never be used by `flutter test`
* the `build/native_assets/<os>/native_assets.yaml` should only be used
by `flutter test` and the dry-run of `flutter run`
=> We change the tests to also comply with these invariants (so the
tests are not testing things that cannot happen in reality)
We also rename `{,Flutter}NativeAssetsBuildRunner` to disambiguate it
from the `package:native_asset_builder`'s `NativeAssetsBuildRunner`.
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