Added hello-triangle demo....

gpu/demos/demos.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     '../../build/common.gypi',
   ],
   'targets': [
     {
       'target_name': 'app_framework',
       'type': 'static_library',
       'dependencies': [
         '../gpu.gyp:command_buffer_client',
         '../gpu.gyp:command_buffer_service',
       ],
       'sources': [
         'app_framework/application.cc',
         'app_framework/application.h',
         'app_framework/platform.h',
       ],
     },
+    {
+      'target_name': 'hello_triangle',
+      'type': 'executable',
+      'dependencies': [
+        'app_framework',
+        '../../third_party/gles_book_examples/gles_book_examples.gyp:hello_triangle',
+      ],
+      'sources': [
+        'hello_triangle/main.cc',
+      ],
+    },
   ]
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: