Move sky/examples to sky/sdk/lib/example, and code changes to support that change. Fixes T277.

sky/examples/raw/spinning_image.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:math' as math;
-import 'dart:sky';
-
-import 'package:sky/mojo/net/image_cache.dart' as image_cache;
-
-double timeBase = null;
-
-Image image = null;
-String url1 = "https://www.dartlang.org/logos/dart-logo.png";
-String url2 = "http://i2.kym-cdn.com/photos/images/facebook/000/581/296/c09.jpg";
-
-void beginFrame(double timeStamp) {
-  if (timeBase == null) timeBase = timeStamp;
-  double delta = timeStamp - timeBase;
-  PictureRecorder recorder = new PictureRecorder();
-  Canvas canvas = new Canvas(recorder, view.width, view.height);
-  canvas.translate(view.width / 2.0, view.height / 2.0);
-  canvas.rotate(math.PI * delta / 1800);
-  canvas.scale(0.2, 0.2);
-  Paint paint = new Paint()..color = const Color.fromARGB(255, 0, 255, 0);
-
-  // Draw image
-  if (image != null)
-    canvas.drawImage(image, -image.width / 2.0, -image.height / 2.0, paint);
-
-  // Draw cut out of image
-  canvas.rotate(math.PI * delta / 1800);
-  if (image != null) {
-    var w = image.width.toDouble();
-    var h = image.width.toDouble();
-    canvas.drawImageRect(image,
-      new Rect.fromLTRB(w * 0.25, h * 0.25, w * 0.75, h * 0.75),
-      new Rect.fromLTRB(-w / 4.0, -h / 4.0, w / 4.0, h / 4.0),
-      paint);
-  }
-
-  view.picture = recorder.endRecording();
-  view.scheduleFrame();
-}
-
-void handleImageLoad(result) {
-  if (result != image) {
-    print("${result.width}x${result.width} image loaded!");
-    image = result;
-    view.scheduleFrame();
-  } else {
-    print("Existing image was loaded again");
-  }
-}
-
-bool handleEvent(Event event) {
-  if (event.type == "pointerdown") {
-    return true;
-  }
-
-  if (event.type == "pointerup") {
-    image_cache.load(url2, handleImageLoad);
-    return true;
-  }
-
-  return false;
-}
-
-void main() {
-  image_cache.load(url1, handleImageLoad);
-  image_cache.load(url1, handleImageLoad);
-  view.setEventCallback(handleEvent);
-  view.setBeginFrameCallback(beginFrame);
-}