Allow arguments to main.

sdk/lib/_internal/compiler/implementation/compiler.dart

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index 93474dc9e7ce61e4fe92380581dbafe22cf230ed..764b7294ed64fe6c7af9c298bde53db612a9aafb 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -1028,13 +1028,22 @@ abstract class Compiler implements DiagnosticListener {
         }
         FunctionElement mainMethod = main;
         FunctionSignature parameters = mainMethod.computeSignature(this);
-        parameters.forEachParameter((Element parameter) {
-          reportError(
-              parameter,
-              MessageKind.GENERIC,
-              {'text':
-                "Error: '$MAIN' cannot have parameters."});
-        });
+        if (parameters.parameterCount > 2) {
+          int argumentCount = 0;
+          parameters.forEachParameter((Element parameter) {
+            argumentCount++;
+            if (argumentCount > 2) {
+              reportError(
+                  parameter,
+                  MessageKind.GENERIC,
+                  {'text':
+                    "Error: '$MAIN' cannot have more than 2 parameters."});
+            }
+          });
+        }
+        if (parameters.parameterCount == 2) {
+          enqueuer.resolution.enableIsolateSupport(main.getLibrary());
+        }
       }
 
       mirrorUsageAnalyzerTask.analyzeUsage(mainApp);