Move fakesky.dart from examples to benchmark/resources

It's not really an example of how to use Sky. It's a resource for benchmarking.

TBR=raf@chromium.org

Review URL: https://codereview.chromium.org/1030423002

examples/fn/lib/fakesky.dart

-import 'dart:async';
-
-void assertHasParentNode(Node n) { assert(n.parentNode != null); }
-void assertHasParentNodes(List<Node> list) {
-  for (var n in list) {
-    assertHasParentNode(n);
-  }
-}
-
-class Node {
-
-  ParentNode parentNode;
-  Node nextSibling;
-  Node previousSibling;
-  Node();
-
-  void insertBefore(List<Node> nodes) {
-    int count = nodes.length;
-    while (count-- > 0) {
-      parentNode._insertBefore(nodes[count], this);
-    }
-
-    assertHasParentNodes(nodes);
-  }
-
-  remove() {
-    if (parentNode == null) {
-      return;
-    }
-
-    if (nextSibling != null) {
-      nextSibling.previousSibling = previousSibling;
-    } else {
-      parentNode.lastChild = previousSibling;
-    }
-
-    if (previousSibling != null) {
-      previousSibling.nextSibling = nextSibling;
-    } else {
-      parentNode.firstChild = nextSibling;
-    }
-
-    parentNode = null;
-    nextSibling = null;
-    previousSibling = null;
-  }
-}
-
-class Text extends Node {
-  String data;
-  Text(this.data) : super();
-}
-
-class ParentNode extends Node {
-  Node firstChild;
-  Node lastChild;
-
-  ParentNode() : super();
-
-  Node setChild(Node node) {
-    firstChild = node;
-    lastChild = node;
-    node.parentNode = this;
-    assertHasParentNode(node);
-    return node;
-  }
-
-  Node _insertBefore(Node node, Node ref) {
-    assert(ref == null || ref.parentNode == this);
-
-    if (node.parentNode != null) {
-      node.remove();
-    }
-
-    node.parentNode = this;
-
-    if (firstChild == null && lastChild == null) {
-      firstChild = node;
-      lastChild = node;
-    } else if (ref == null) {
-      node.previousSibling = lastChild;
-      lastChild.nextSibling = node;
-      lastChild = node;
-    } else {
-      if (ref == firstChild) {
-        assert(ref.previousSibling == null);
-        firstChild = node;
-      }
-      node.previousSibling = ref.previousSibling;
-      ref.previousSibling = node;
-      node.nextSibling = ref;
-    }
-
-    assertHasParentNode(node);
-    return node;
-  }
-
-  Node appendChild(Node node) {
-    return _insertBefore(node, null);
-  }
-}
-
-class Element extends ParentNode {
-  void addEventListener(String type, EventListener listener, [bool useCapture = false]) {}
-  void removeEventListener(String type, EventListener listener) {}
-  void setAttribute(String name, [String value]) {}
-}
-
-class Document extends ParentNode {
-  Document();
-  Element createElement(String tagName) {
-    switch (tagName) {
-      case 'img' : return new HTMLImageElement();
-      default : return new Element();
-    }
-  }
-}
-
-class HTMLImageElement extends Element {
-  HTMLImageElement();
-  String src;
-  Object style = {};
-}
-
-class Event {}
-
-class PointerEvent extends Event {}
-class GestureEvent extends Event {}
-class WheelEvent extends Event {}
-
-typedef EventListener(Event event);
-
-void _callRAF(Function fn) {
-  fn(new DateTime.now().millisecondsSinceEpoch.toDouble());
-}
-
-class Window {
-  int requestAnimationFrame(Function fn) {
-    new Timer(const Duration(milliseconds: 16), () {
-      _callRAF(fn);
-    });
-    return 1;
-  }
-
-  void cancelAnimationFrame(int id) {
-  }
-}
-
-Document document = new Document();
-
-Window window = new Window();
-
-class ClientRect {
-    double top;
-    double right;
-    double bottomr;
-    double left;
-    double width;
-    double height;
-}