Implement InstanceMirror.getField/setField (minified).

dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index b1786bb2679fcc29fcf8ec808665599bc779dc0a..e85e9e9be7603cca263ae3a01eefba128d3088d6 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -73,6 +73,7 @@ class CodeEmitterTask extends CompilerTask {
   final List<ClassElement> deferredClasses = <ClassElement>[];
   final List<ClassElement> nativeClasses = <ClassElement>[];
   final List<Selector> trivialNsmHandlers = <Selector>[];
+  final Map<String, String> mangledFieldNames = <String, String>{};
 
   // TODO(ngeoffray): remove this field.
   Set<ClassElement> instantiatedClasses;
@@ -1460,6 +1461,21 @@ class CodeEmitterTask extends CompilerTask {
     /* Do nothing. */
   }
 
+  void recordMangledField(Element member,
+                          String accessorName,
+                          String memberName) {
+    String previousName = mangledFieldNames.putIfAbsent(
+        '${namer.getterPrefix}$accessorName',
+        () => memberName);
+    assert(invariant(member, previousName == memberName,
+                     message: '$previousName != ${memberName}'));
+    previousName = mangledFieldNames.putIfAbsent(
+        '${namer.setterPrefix}$accessorName',
+        () => '${memberName}=');
+    assert(invariant(member, previousName == '${memberName}=',
+                     message: '$previousName != ${memberName}='));
+  }
+
   /// Returns `true` if fields added.
   bool emitClassFields(ClassElement classElement,
                        ClassBuilder builder,
@@ -1500,6 +1516,9 @@ class CodeEmitterTask extends CompilerTask {
             hasMetadata = true;
           }
         }
+        if (compiler.mirrorsEnabled) {
+          recordMangledField(member, accessorName, member.name.slowToString());
+        }
         if (!needsAccessor) {
           // Emit field for constructor generation.
           assert(!classIsNative);
@@ -3087,6 +3106,22 @@ if (typeof document !== "undefined" && document.readyState !== "complete") {
         if (compiler.enableMinification) {
           mainBuffer.write(';');
         }
+        if (!mangledFieldNames.isEmpty) {
+          var keys = mangledFieldNames.keys.toList();
+          keys.sort();
+          var properties = [];
+          for (String key in keys) {
+            var value = js.string('${mangledFieldNames[key]}');
+            properties.add(new jsAst.Property(js.string(key), value));
+          }
+          var map = new jsAst.ObjectInitializer(properties);
+          mainBuffer.write(
+              jsAst.prettyPrint(
+                  js('init.mangledNames = #', map).toStatement(), compiler));
+          if (compiler.enableMinification) {
+            mainBuffer.write(';');
+          }
+        }
         mainBuffer
             ..write(getReflectionDataParser())
             ..write('([$n');