Merge the openglui samples into one.

samples/openglui/openglui.gyp

+# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+{
+  'variables': {
+    # Disable the OpenGLUI embedder by default on desktop OSes.  Note,
+    # to build this on the desktop, you need GLUT installed.
+    # TODO(vsm): This is also defined in runtime/dart-runtime.gyp.  Can we
+    # reuse that definition?
+    'enable_openglui%': 0,
+  },
+  'targets': [
+    {
+      'target_name': 'openglui_sample',
+      'type': 'none',
+      'conditions': [
+        ['OS=="android"', {
+            'dependencies': [
+              'android/android.gyp:android_sample',
+            ],
+          },
+        ],
+        ['enable_openglui==1', {
+            'dependencies': [
+              'emulator/emulator.gyp:mobile_emulator_sample',
+            ],
+          },
+        ],
+      ],
+    },
+  ],
+}