Add a platform plugin infrastructure.

lib/src/runner/vm/catch_isolate_errors.dart

Index: lib/src/runner/vm/catch_isolate_errors.dart
diff --git a/lib/src/runner/vm/catch_isolate_errors.dart b/lib/src/runner/vm/catch_isolate_errors.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c42719726243b1437b1086e3bedbc88ab0672eb5
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+++ b/lib/src/runner/vm/catch_isolate_errors.dart
@@ -0,0 +1,25 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:isolate';
+import 'dart:async';
+
+import 'package:stack_trace/stack_trace.dart';
+
+/// Capture any top-level errors (mostly lazy syntax errors, since other are
+/// caught below) and report them to the parent isolate.
+void catchIsolateErrors() {
+  var errorPort = new ReceivePort();
+  // Aet errors non-fatal because otherwise they'll be double-printed.
+  Isolate.current.setErrorsFatal(false);
+  Isolate.current.addErrorListener(errorPort.sendPort);
+  errorPort.listen((message) {
+    // Masquerade as an IsoalteSpawnException because that's what this would
+    // be if the error had been detected statically.
+    var error = new IsolateSpawnException(message[0]);
+    var stackTrace =
+        message[1] == null ? new Trace([]) : new Trace.parse(message[1]);
+    Zone.current.handleUncaughtError(error, stackTrace);
+  });
+}