Unifying compiler context

utils/kernel-service/kernel-service.dart

Index: utils/kernel-service/kernel-service.dart
diff --git a/utils/kernel-service/kernel-service.dart b/utils/kernel-service/kernel-service.dart
index 5b7ca5031c378a729bd9740d5777ef6e21fe4d27..e10eb8c50ff7632746601f1717226b067d99c7f7 100644
--- a/utils/kernel-service/kernel-service.dart
+++ b/utils/kernel-service/kernel-service.dart
@@ -78,12 +78,22 @@ Future _processLoadRequest(request) async {
     ..packagesFileUri = packagesUri
     ..sdkSummary = sdkSummary
     ..verbose = verbose
-    ..onError = (CompilationError e) => errors.add(e.message);
+    ..throwOnErrors = false
+    ..reportMessages = true
+    ..onError = (CompilationMessage e) {
+      if (e.severity == Severity.error) {
+        // TODO(sigmund): support emitting code with errors as long as they are
+        // handled in the generated code (issue #30194).
+        errors.add(e.message);
+      }
+    };
 
   CompilationResult result;
   try {
     Program program = await kernelForProgram(script, options);
     if (errors.isNotEmpty) {
+      // TODO(sigmund): the compiler prints errors to the console, so we
+      // shouldn't print those messages again here.
       result = new CompilationResult.errors(errors);
     } else {
       // We serialize the program excluding platform.dill because the VM has