Emit CSP code in separate file.

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

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 321 matching lines @@
     assert(superclass != null);
     // Fix superclass.  TODO(sra): make native classes inherit from Interceptor.
     assert(superclass != compiler.objectClass);
     if (superclass == compiler.objectClass) {
       superclass = backend.jsInterceptorClass;
     }
 
     String superName = backend.namer.getNameOfClass(superclass);
 
     ClassBuilder builder = new ClassBuilder();
-    emitter.emitClassConstructor(classElement, builder);
+    emitter.emitClassConstructor(classElement, builder, null);
     emitter.emitSuper(superName, builder);
     bool hasFields = emitter.emitFields(
         classElement, builder, superName, classIsNative: true);
     int propertyCount = builder.properties.length;
     emitter.emitClassGettersSetters(classElement, builder);
     emitter.emitInstanceMembers(classElement, builder);
     emitter.emitIsTests(classElement, builder);
 
     if (!hasFields &&
         builder.properties.length == propertyCount &&
@@ skipping 180 matching lines @@
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(jsAst.prettyPrint(
           new jsAst.ExpressionStatement(init), compiler));
       targetBuffer.add('\n');
     }
 
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }