More DDC mirrors support

pkg/dev_compiler/test/codegen_expected/sunflower/sunflower.js

 define(['dart_sdk'], function(dart_sdk) {
   'use strict';
   const core = dart_sdk.core;
   const html = dart_sdk.html;
   const math = dart_sdk.math;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const sunflower = Object.create(null);
   const circle = Object.create(null);
   const painter = Object.create(null);
@@ skipping 54 matching lines @@
   };
   dart.fn(sunflower.draw, VoidTovoid());
   circle.Circle = class Circle extends core.Object {
     new(x, y, radius) {
       this.x = x;
       this.y = y;
       this.radius = radius;
     }
   };
   dart.setSignature(circle.Circle, {
-    constructors: () => ({new: dart.definiteFunctionType(circle.Circle, [core.num, core.num, core.num])})
+    constructors: () => ({new: dart.definiteFunctionType(circle.Circle, [core.num, core.num, core.num])}),
+    fields: () => ({
+      x: core.num,
+      y: core.num,
+      radius: core.num
+    })
   });
   painter.CirclePainter = class CirclePainter extends core.Object {
     new() {
       this.color = painter.ORANGE;
     }
     draw(context) {
       context[dartx.beginPath]();
       context[dartx.lineWidth] = 2;
       context[dartx.fillStyle] = this.color;
       context[dartx.strokeStyle] = this.color;
       context[dartx.arc](this.x, this.y, this.radius, 0, painter.TAU, false);
       context[dartx.fill]();
       context[dartx.closePath]();
       context[dartx.stroke]();
     }
   };
   painter.CirclePainter[dart.implements] = () => [circle.Circle];
   dart.setSignature(painter.CirclePainter, {
+    fields: () => ({color: core.String}),
     methods: () => ({draw: dart.definiteFunctionType(dart.void, [html.CanvasRenderingContext2D])})
   });
   sunflower.SunflowerSeed = class SunflowerSeed extends dart.mixin(circle.Circle, painter.CirclePainter) {
     new(x, y, radius, color) {
       if (color === void 0) color = null;
       super.new(x, y, radius);
       if (color != null) this.color = color;
     }
   };
   dart.setSignature(sunflower.SunflowerSeed, {
@@ skipping 19 matching lines @@
   });
   // Exports:
   return {
     sunflower: sunflower,
     circle: circle,
     painter: painter
   };
 });
 
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