Add option for outputting a deferred loading mapping.

pkg/compiler/lib/src/compiler.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 dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 650 matching lines @@
 
   /// When `true` emits URIs in the reflection metadata.
   final bool preserveUris;
 
   final bool enableTypeAssertions;
   final bool enableUserAssertions;
   final bool trustTypeAnnotations;
   final bool trustPrimitives;
   final bool enableConcreteTypeInference;
   final bool disableTypeInferenceFlag;
+  final Uri deferredMapUri;
   final bool dumpInfo;
   final bool useContentSecurityPolicy;
   final bool enableExperimentalMirrors;
 
   /**
    * The maximum size of a concrete type before it widens to dynamic during
    * concrete type inference.
    */
   final int maxConcreteTypeSize;
   final bool analyzeAllFlag;
@@ skipping 296 matching lines @@
             bool analyzeAllFlag: false,
             bool analyzeOnly: false,
             this.analyzeMain: false,
             bool analyzeSignaturesOnly: false,
             this.preserveComments: false,
             this.verbose: false,
             this.sourceMapUri: null,
             this.outputUri: null,
             this.buildId: UNDETERMINED_BUILD_ID,
             this.terseDiagnostics: false,
+            this.deferredMapUri: null,
             this.dumpInfo: false,
             this.showPackageWarnings: false,
             this.useContentSecurityPolicy: false,
             this.suppressWarnings: false,
             bool hasIncrementalSupport: false,
             this.enableExperimentalMirrors: false,
             this.enableAsyncAwait: false,
             this.enableEnums: false,
             this.allowNativeExtensions: false,
             api.CompilerOutputProvider outputProvider,
@@ skipping 528 matching lines @@
   /// Performs the compilation when all libraries have been loaded.
   void compileLoadedLibraries() {
     computeMain();
 
     mirrorUsageAnalyzerTask.analyzeUsage(mainApp);
 
     // In order to see if a library is deferred, we must compute the
     // compile-time constants that are metadata.  This means adding
     // something to the resolution queue.  So we cannot wait with
     // this until after the resolution queue is processed.
-    deferredLoadTask.ensureMetadataResolved(this);
+    deferredLoadTask.beforeResolution(this);
 
     phase = PHASE_RESOLVING;
     if (analyzeAll) {
       libraryLoader.libraries.forEach((LibraryElement library) {
         log('Enqueuing ${library.canonicalUri}');
         fullyEnqueueLibrary(library, enqueuer.resolution);
       });
     } else if (analyzeMain && mainApp != null) {
       fullyEnqueueLibrary(mainApp, enqueuer.resolution);
     }
@@ skipping 862 matching lines @@
   InterfaceType get nullType => nullClass.computeType(compiler);
 
   @override
   InterfaceType get numType => numClass.computeType(compiler);
 
   @override
   InterfaceType get stringType =>  stringClass.computeType(compiler);
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);