Add a very simple example pepper plugin that uses a 3d context

ppapi/ppapi_tests.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
      {
       'target_name': 'ppapi_example',
       'dependencies': [
         'ppapi.gyp:ppapi_cpp'
@@ skipping 348 matching lines @@
       'target_name': 'ppapi_example_url_loader',
       'dependencies': [
         'ppapi_example_skeleton',
         'ppapi.gyp:ppapi_cpp',
       ],
       'sources': [
         'examples/url_loader/streaming.cc',
       ],
     },
     {
+      'target_name': 'ppapi_example_gles2',
+      'dependencies': [
+        'ppapi_example_skeleton',
+        'ppapi.gyp:ppapi_cpp',
+        'ppapi.gyp:ppapi_gles2',
+        'ppapi.gyp:ppapi_egl',
+      ],
+      'include_dirs': [
+        'lib/gl/include',
+      ],
+      'sources': [
+        'examples/gles2/gles2.cc',
+      ],
+    },
+    {
       'target_name': 'ppapi_example_video_decode',
       'dependencies': [
         'ppapi_example_skeleton',
         'ppapi.gyp:ppapi_cpp',
         'ppapi.gyp:ppapi_gles2',
         'ppapi.gyp:ppapi_egl',
       ],
       'include_dirs': [
         'lib/gl/include',
       ],
@@ skipping 32 matching lines @@
       'dependencies': [
         'ppapi_example_skeleton',
         'ppapi.gyp:ppapi_cpp',
       ],
       'sources': [
         'examples/printing/printing.cc',
       ],
     },
   ],
 }