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

sky/sdk/lib/example/raw/launcher.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";
 import 'dart:sky';
 
 import 'package:sky/framework/shell.dart' as shell;
 import 'package:mojom/intents/intents.mojom.dart';
 
@@ skipping 17 matching lines @@
     return true;
   }
 
   if (event.type == "pointerup") {
     view.picture = draw(255, 255, 255, 0);
     view.scheduleFrame();
 
     ActivityManagerProxy activityManager = new ActivityManagerProxy.unbound();
     Intent intent = new Intent()
       ..action = 'android.intent.action.VIEW'
-      ..url = 'sky://localhost:9888/sky/examples/raw/hello_world.dart';
+      ..url = 'sky://localhost:9888/sky/sdk/lib/example/raw/hello_world.dart';
     shell.requestService(null, activityManager);
     activityManager.ptr.startActivity(intent);
     return true;
   }
 
   if (event.type == "back") {
     print("Pressed back button.");
     return true;
   }
 
   return false;
 }
 
 void main() {
   print("Hello, world");
   view.picture = draw(255, 255, 255, 0);
   view.scheduleFrame();
 
   view.setEventCallback(handleEvent);
 }