Implement testing support for "--compiler=none --runtime=dartium"

tools/testing/dart/browser_test.dart

Index: tools/testing/dart/browser_test.dart
diff --git a/tools/testing/dart/browser_test.dart b/tools/testing/dart/browser_test.dart
index dbfd7e529635ab9207ff68126975ece86e7df5f8..e37d029a3ce0b970ad7a5cb64d4cfe0a657c2cfc 100644
--- a/tools/testing/dart/browser_test.dart
+++ b/tools/testing/dart/browser_test.dart
@@ -55,7 +55,7 @@ String getHtmlLayoutContents(String scriptType,
 </html>
 """;
 
-String dartTestWrapper(bool usePackageImport, String libraryPathComponent) {
+String dartUnittestWrapper(bool usePackageImport, String libraryPathComponent) {
   // Tests inside "pkg" import unittest using "package:". All others use a
   // relative path. The imports need to agree, so use a matching form here.
   var unitTest;
@@ -77,3 +77,15 @@ main() {
 }
 """;
 }
+
+String dartTestWrapper(String libraryPathComponent) {
+  return """
+import '$libraryPathComponent' as test;
+
+main() {
+  print("dart-calling-main");
+  test.main();
+  print("dart-main-done");
+}
+""";
+}