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This PR adds `String? identifier` to `SemanticsUpdateBuilder` (currently it's only available in the temproary `SemanticsUpdateBuilderNew` API. This is mainly targeted at https://github.com/flutter/flutter/issues/17988 Steps: part 1: [engine] add `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/47961 part 2: [flutter] use `SemanticsUpdateBuilderNew` https://github.com/flutter/flutter/pull/138331 **part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew`** <-- we are here part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again. part 5: [engine] remove `SemanticsBuilderNew`
ui_unittest Fixtures
The files in this directory are used by the ui_unittests binary.
The ui_test.dart file is either JIT or AOT compiled depending on the runtime
mode of the test binary. Other files in this folder are used by tests to verify
functionality.
See //lib/ui/BUILD.gn and //testing/testing.gni for the build rules and
GN template definitions that determine which files get included and compiled
here.