Add support for testing content in SkyView

sky/tests/raw/render_box.dart

Index: sky/tests/raw/render_box.dart
diff --git a/sky/tests/raw/render_box.dart b/sky/tests/raw/render_box.dart
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+++ b/sky/tests/raw/render_box.dart
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+// 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 '../resources/third_party/unittest/unittest.dart';
+import '../resources/unit.dart';
+import 'dart:sky' as sky;
+import 'package:sky/framework/layout2.dart';
+
+class RenderSizedBox extends RenderBox {
+  final double desiredHeight;
+  final double desiredWidth;
+
+  RenderSizedBox({ this.desiredHeight: double.INFINITY,
+                   this.desiredWidth: double.INFINITY });
+
+  BoxDimensions getIntrinsicDimensions(BoxConstraints constraints) {
+    return new BoxDimensions.withConstraints(constraints,
+                                             height: desiredHeight,
+                                             width: desiredWidth);
+  }
+
+  void layout(BoxConstraints constraints, { RenderNode relayoutSubtreeRoot }) {
+    width = constraints.constrainWidth(desiredWidth);
+    height = constraints.constrainHeight(desiredHeight);
+    layoutDone();
+  }
+}
+
+void main() {
+  initUnit();
+
+  test("should size to render view", () {
+    RenderSizedBox root = new RenderSizedBox();
+    RenderView renderView = new RenderView(root: root);
+    renderView.layout(newWidth: sky.view.width, newHeight: sky.view.height);
+    expect(root.width, equals(sky.view.width));
+    expect(root.height, equals(sky.view.height));
+  });
+}