Push updates to browser.

dart/pkg/dart2js_incremental/lib/dart2js_incremental.dart

 // Copyright (c) 2014, 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.
 
 library dart2js_incremental;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 132 matching lines @@
     });
   }
 
   String allUpdates() {
     jsAst.Node updates = jsAst.js.escapedString(_updates.join(""));
 
     JavaScriptBackend backend = _compiler.backend;
 
     jsAst.FunctionDeclaration mainRunner = jsAst.js.statement(r"""
 function dartMainRunner(main, args) {
-  #helper.patch(#updates);
+  #helper.patch(#updates + "\n//# sourceURL=initial_patch.js\n");
   return main(args);
 }""", {'updates': updates, 'helper': backend.namer.accessIncrementalHelper});
 
     jsAst.Printer printer = new jsAst.Printer(_compiler, null);
     printer.blockOutWithoutBraces(mainRunner);
     return printer.outBuffer.getText();
   }
 }
 
 class IncrementalCompilationFailed {
   final String reason;
 
   const IncrementalCompilationFailed(this.reason);
 
   String toString() => "Can't incrementally compile program.\n\n$reason";
 }