Read platform.dill in the VM.

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index d8863273c4d849c23b89f55804d71a082f3a992b..e88af22b3301fff13398a478225111dddff2c5b2 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -214,6 +214,7 @@ class NoneCompilerConfiguration extends CompilerConfiguration {
     List<String> args = [];
     if (useDFE) {
       args.add('--dfe=${buildDir}/gen/kernel-service.dart.snapshot');
+      args.add('--platform=${buildDir}/patched_sdk/platform.dill');

[ahe, 2017/03/31 10:13:09]

How about creating an outline of the platform file and passing that to Fasta?

[Kevin Millikin (Google), 2017/04/25 18:20:29]

That's an excellent suggestion.  Let's discuss how to do it.

     }
     if (isChecked) {
       args.add('--enable_asserts');