Decouple WorkItem from Compiler

pkg/dart2js_incremental/lib/caching_compiler.dart

 // Copyright (c) 2013, 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 dart2js_incremental;
 
 /// Do not call this method directly. It will be made private.
 // TODO(ahe): Make this method private.
 Future<CompilerImpl> reuseCompiler(
     {CompilerDiagnostics diagnosticHandler,
@@ skipping 67 matching lines @@
         ..needsLazyInitializer = true
         ..needsStructuredMemberInfo = true;
 
     Uri core = Uri.parse("dart:core");
 
     return compiler.setupSdk().then((_) {
       return compiler.libraryLoader.loadLibrary(core).then((_) {
         // Likewise, always be prepared for runtimeType support.
         // TODO(johnniwinther): Add global switch to force RTI.
         compiler.resolverWorld.hasRuntimeTypeSupport = true;
-        backend.registerRuntimeType(compiler.enqueuer.resolution);
+        compiler.enqueuer.resolution.applyImpact(backend.registerRuntimeType());
         return compiler;
       });
     });
   } else {
     compiler.tasks.forEach((t) => t.clearMeasurements());
     compiler
         ..userOutputProvider = outputProvider
         ..provider = inputProvider
         ..handler = diagnosticHandler
         ..enqueuer.resolution.queueIsClosed = false
@@ skipping 91 matching lines @@
   final Map<String, String> output = new Map<String, String>();
 
   EventSink<String> createEventSink(String name, String extension) {
     return new StringEventSink((String data) {
       output['$name.$extension'] = data;
     });
   }
 
   String operator[] (String key) => output[key];
 }