Add a SpinningCube to Mojo's sample_app

mojo/mojo.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 213 matching lines @@
       ],
       'sources': [
         'public/utility/scoped_handle.cc',
         'public/utility/scoped_handle.h',
       ],
     },
     {
       'target_name': 'sample_app',
       'type': 'shared_library',
       'dependencies': [
+        '../ui/gl/gl.gyp:gl',
         'mojo_system',
       ],
       'sources': [
         'examples/sample_app/sample_app.cc',
+        'examples/sample_app/spinning_cube.cc',
+        'examples/sample_app/spinning_cube.h',
       ],
     },
     {
       'target_name': 'mojo_bindings',
       'type': 'static_library',
       'include_dirs': [
         '..'
       ],
       'sources': [
         'public/bindings/lib/bindings.h',
@@ skipping 143 matching lines @@
             'java_in_dir': '<(DEPTH)/mojo/shell/android/apk',
             'resource_dir': '<(DEPTH)/mojo/shell/android/apk/res',
             'native_lib_target': 'libmojo_shell',
           },
           'includes': [ '../build/java_apk.gypi' ],
         }
       ],
     }],
   ],
 }