Incremental compilation: set up inheritance.

dart/pkg/compiler/lib/src/js_emitter/old_emitter/emitter.dart

 // Copyright (c) 2014, 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;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 286 matching lines @@
     // defineClassFunction (it's a local declaration in init()).
     return [
         generateAccessorFunction,
         js('$generateAccessorHolder = generateAccessor'),
         new jsAst.FunctionDeclaration(
             new jsAst.VariableDeclaration('defineClass'), defineClass) ];
   }
 
   /** Needs defineClass to be defined. */
   jsAst.Expression buildInheritFrom() {
-    return js(r'''
-        var inheritFrom = function() {
+    jsAst.Expression result = js(r'''
+        function() {
           function tmp() {}
           var hasOwnProperty = Object.prototype.hasOwnProperty;
           return function (constructor, superConstructor) {
             tmp.prototype = superConstructor.prototype;
             var object = new tmp();
             var properties = constructor.prototype;
             for (var member in properties) {
               if (hasOwnProperty.call(properties, member)) {
                 object[member] = properties[member];
               }
             }
             object.constructor = constructor;
             constructor.prototype = object;
             return object;
           };
         }()
       ''');
+    if (compiler.hasIncrementalSupport) {
+      result = js(r'self.$dart_unsafe_eval.inheritFrom = #', [result]);
+    }
+    return js(r'var inheritFrom = #', [result]);
   }
 
   /// Code that needs to be run before first invocation of
   /// [finishClassesFunction], but should only be run once.
   jsAst.Expression get initFinishClasses {
     jsAst.Expression allClassesAccess =
         generateEmbeddedGlobalAccess(embeddedNames.ALL_CLASSES);
     jsAst.Expression interceptorsByTagAccess =
         generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG);
     jsAst.Expression leafTagsAccess =
@@ skipping 1697 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }