Move simple_render_tree into tests as render_flex

sky/examples/raw/simple_render_tree.dart

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'dart:sky';
-import 'package:sky/framework/app.dart';
-import 'package:sky/framework/layout2.dart';
-
-class RenderSolidColor extends RenderDecoratedBox {
-  final Size desiredSize;
-  final int backgroundColor;
-
-  RenderSolidColor(int backgroundColor, { this.desiredSize: const sky.Size.infinite() })
-      : backgroundColor = backgroundColor,
-        super(new BoxDecoration(backgroundColor: backgroundColor)) {
-  }
-
-  BoxDimensions getIntrinsicDimensions(BoxConstraints constraints) {
-    return new BoxDimensions.withConstraints(constraints,
-                                             width: desiredSize.width,
-                                             height: desiredSize.height);
-  }
-
-  void performLayout() {
-    size = constraints.constrain(desiredSize);
-  }
-
-  void handlePointer(PointerEvent event) {
-    if (event.type == 'pointerdown')
-      decoration = new BoxDecoration(backgroundColor: 0xFFFF0000);
-    else if (event.type == 'pointerup')
-      decoration = new BoxDecoration(backgroundColor: backgroundColor);
-  }
-}
-
-AppView app;
-
-void main() {
-  var root = new RenderFlex(
-      direction: FlexDirection.Vertical,
-      decoration: new BoxDecoration(backgroundColor: 0xFF000000));
-
-  void addFlexChild(RenderFlex parent, int backgroundColor, { int flex: 0 }) {
-    RenderNode child = new RenderSolidColor(backgroundColor);
-    parent.add(child);
-    child.parentData.flex = flex;
-  }
-
-  // Yellow bar at top
-  addFlexChild(root, 0xFFFFFF00, flex: 1);
-
-  // Turquoise box
-  root.add(new RenderSolidColor(0x7700FFFF, desiredSize: new Size(100.0, 100.0)));
-
-  // Green and cyan render block with padding
-  var renderBlock = new RenderBlock(decoration: new BoxDecoration(backgroundColor: 0xFFFFFFFF));
-
-  renderBlock.add(new RenderSolidColor(0xFF00FF00, desiredSize: new Size(100.0, 50.0)));
-  renderBlock.add(new RenderSolidColor(0x7700FFFF, desiredSize: new Size(50.0, 100.0)));
-
-  root.add(new RenderPadding(const EdgeDims(10.0, 10.0, 10.0, 10.0), renderBlock));
-
-  var row = new RenderFlex(
-    direction: FlexDirection.Horizontal,
-    decoration: new BoxDecoration(backgroundColor: 0xFF333333));
-
-  // Purple and blue cells
-  addFlexChild(row, 0x77FF00FF, flex: 1);
-  addFlexChild(row, 0xFF0000FF, flex: 2);
-
-  root.add(row);
-  row.parentData.flex = 3;
-
-  app = new AppView(root);
-
-}