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Chris Bracken
67cd7d4d3b
As of the migration to Dart 2, it has been necessary to compile Dart to kernel prior to execution. The embedder currently requires that the resulting kernel file be named `kernel_blob.bin` and be located at the root of the assets directory passed to the embedder API. This patch updates the test_fixtures build rule to perform a kernel compile using frontend_server, outputting `kernel_blob.bin` to `fixtures/test_target_name` directory, and updates the embedder unittests to specify the kernel file rather than the Dart source file. Since the kernel compiler requires a `main()` function to be defined, it also updates `simple_main.dart` from runtime_unittests to define `main()` rather than `simple_main()`. This also updates all existing sub-targets to be testonly. This relands commitac9e521a1d, which was reverted in commit4941125829. Rather than running as prebuilt_dart_action, we use dart_action to ensure the frontend snapshot it compatible with the VM on which it's executed.