Implement reflection on function type aliases (typedef).

dart/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;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked;
 
   JavaScriptItemCompilationContext()
@@ skipping 323 matching lines @@
   /// List of elements that the user has requested for reflection.
   final Set<Element> targetsUsed = new Set<Element>();
 
   /// List of annotations provided by user that indicate that the annotated
   /// element must be retained.
   final Set<Element> metaTargetsUsed = new Set<Element>();
 
   /// List of elements that the backend may use.
   final Set<Element> helpersUsed = new Set<Element>();
 
+  /// Set of typedefs that are used as type literals.
+  final Set<TypedefElement> typedefTypeLiterals = new Set<TypedefElement>();
+
   JavaScriptBackend(Compiler compiler, bool generateSourceMap, bool disableEval)
       : namer = determineNamer(compiler),
         oneShotInterceptors = new Map<String, Selector>(),
         interceptedElements = new Map<SourceString, Set<Element>>(),
         rti = new RuntimeTypes(compiler),
         specializedGetInterceptors = new Map<String, Set<ClassElement>>(),
         super(compiler, JAVA_SCRIPT_CONSTANT_SYSTEM) {
     emitter = disableEval
         ? new CodeEmitterNoEvalTask(compiler, namer, generateSourceMap)
         : new CodeEmitterTask(compiler, namer, generateSourceMap);
@@ skipping 449 matching lines @@
 
   void registerLazyField(TreeElements elements) {
     enqueueInResolution(getCyclicThrowHelper(), elements);
   }
 
   void registerTypeLiteral(Element element, TreeElements elements) {
     enqueueInResolution(getCreateRuntimeType(), elements);
     // TODO(ahe): Might want to register [element] as an instantiated class
     // when reflection is used.  However, as long as we disable tree-shaking
     // eagerly it doesn't matter.
+    if (element.isTypedef()) {
+      typedefTypeLiterals.add(element);
+    }
   }
 
   void registerStackTraceInCatch(TreeElements elements) {
     enqueueInResolution(getTraceFromException(), elements);
   }
 
   void registerSetRuntimeType(TreeElements elements) {
     enqueueInResolution(getSetRuntimeTypeInfo(), elements);
   }
 
@@ skipping 869 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }