Add NativeEnqueuer to work with the Enqueuer.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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;
 
 typedef void Recompile(Element element);
 
 class ReturnInfo {
   HType returnType;
@@ skipping 793 matching lines @@
       compiler.codegenWorld.addBailoutCode(work, codeBuffer);
       optimizer.prepareForSpeculativeOptimizations(work, graph);
       optimizer.optimize(work, graph, true);
     }
     CodeBuffer codeBuffer = generator.generateCode(work, graph);
     compiler.codegenWorld.addGeneratedCode(work, codeBuffer);
     invalidateAfterCodegen.forEach(compiler.enqueuer.codegen.eagerRecompile);
     invalidateAfterCodegen.clear();
   }
 
-  void processNativeClasses(Enqueuer world,
-                            Collection<LibraryElement> libraries) {
-    native.processNativeClasses(world, emitter, libraries);
-  }
+
+  native.NativeEnqueuer nativeResolutionEnqueuer(Enqueuer world,
+                                                 bool liveTypeAnalysis) =>

[ngeoffray, 2012/11/14 21:17:39]

Use {} instead.

[sra1, 2012/11/15 00:09:10]

OK, but I don't really agree with a style guideline that forces you to change
from => to {} depending on whether you add a parameter or change the name of a
parameter type.
That is causing required edits that the autoindenting in your favorite editor
cannot handle.

It is dangerous to do the change - I forgot 'return' and it cost me some time. 
It is much safer to adopt guidelines that don't force you to make error-prone
changes.

+      new native.NativeResolutionEnqueuer(world, compiler, liveTypeAnalysis);
+
+  native.NativeEnqueuer nativeCodegenEnqueuer(Enqueuer world,
+                                              bool liveTypeAnalysis) =>

[ngeoffray, 2012/11/14 21:17:39]

ditto

+      new native.NativeCodegenEnqueuer(
+          world, compiler, emitter, liveTypeAnalysis);
 
   void assembleProgram() {
     emitter.assembleProgram();
   }
 
   /**
    * Documentation wanted -- johnniwinther
    *
    * Invariant: [element] must be a declaration element.
    */
@@ skipping 187 matching lines @@
     print("Inferred return types:");
     print("----------------------");
     dumpReturnTypes();
     print("");
     print("Inferred field types:");
     print("------------------------");
     fieldTypes.dump();
     print("");
   }
 }