Figure out how to write a different HelloWorld.

gyp/example.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # GYP file to build hello world example.
 {
   'targets': [
     {
       'target_name': 'HelloWorld',
       'type': 'executable',
       'mac_bundle' : 1,
       'include_dirs' : [
         '../include/gpu',
       ],
       'sources': [
-        '../example/HelloWorld.h',
-        '../example/HelloWorld.cpp',
+        '../experimental/example.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'views.gyp:views',
       ],
       'conditions' : [
         [ 'skia_os == "win"', {
           'sources' : [
             '../src/views/win/SkOSWindow_Win.cpp',
             '../src/views/win/skia_win.cpp',
@@ skipping 18 matching lines @@
             'INFOPLIST_FILE' : '../example/mac/HelloWorld-Info.plist',
           },
           'mac_bundle_resources' : [
             '../example/mac/HelloWorld.xib'
           ],
         }],
       ],
     },
   ],
 }