dart2js: Emit static const fields if accessible by reflections.

pkg/compiler/lib/src/js_emitter/program_builder/collector.dart

 // Copyright (c) 2015, 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.js_emitter.program_builder;
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
@@ skipping 256 matching lines @@
     for (Element element in Elements.sortedByPosition(elements)) {
       List<Element> list = outputStaticLists.putIfAbsent(
           compiler.deferredLoadTask.outputUnitForElement(element),
           () => new List<Element>());
       list.add(element);
     }
   }
 
   void computeNeededStaticNonFinalFields() {
     JavaScriptConstantCompiler handler = backend.constants;
+    addToOutputUnit(Element element) {
+      List<VariableElement> list = outputStaticNonFinalFieldLists.putIfAbsent(
+          compiler.deferredLoadTask.outputUnitForElement(element),
+              () => new List<VariableElement>());
+      list.add(element);
+    }
+
     Iterable<VariableElement> staticNonFinalFields = handler
         .getStaticNonFinalFieldsForEmission()
         .where(compiler.codegenWorld.allReferencedStaticFields.contains);
-    for (Element element in Elements.sortedByPosition(staticNonFinalFields)) {
-      List<VariableElement> list = outputStaticNonFinalFieldLists.putIfAbsent(
-          compiler.deferredLoadTask.outputUnitForElement(element),
-          () => new List<VariableElement>());
-      list.add(element);
-    }
+
+    Elements.sortedByPosition(staticNonFinalFields).forEach(addToOutputUnit);
+
+    // We also need to emit static const fields if they are available for
+    // reflection.
+    compiler.codegenWorld.allReferencedStaticFields
+        .where((FieldElement field) => field.isConst)
+        .where(backend.isAccessibleByReflection)
+        .forEach(addToOutputUnit);
   }
 
   void computeNeededLibraries() {
     void addSurroundingLibraryToSet(Element element) {
       OutputUnit unit = compiler.deferredLoadTask.outputUnitForElement(element);
       LibraryElement library = element.library;
       outputLibraryLists.putIfAbsent(unit, () => new Set<LibraryElement>())
           .add(library);
     }
 
     backend.generatedCode.keys.forEach(addSurroundingLibraryToSet);
     neededClasses.forEach(addSurroundingLibraryToSet);
   }
 
   void collect() {
     computeNeededDeclarations();
     computeNeededConstants();
     computeNeededStatics();
     computeNeededStaticNonFinalFields();
     computeNeededLibraries();
   }
 }