Pepper: Add a function to PPB_Flash to check if a rect is topmost.

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 378 matching lines @@
         'ppapi.gyp:ppapi_gles2',
         'ppapi.gyp:ppapi_egl',
       ],
       'include_dirs': [
         'lib/gl/include',
       ],
       'sources': [
         'examples/video_capture/video_capture.cc',
       ],
     },
+    {
+      'target_name': 'ppapi_example_flash_topmost',
+      'dependencies': [
+        'ppapi_example_skeleton',
+        'ppapi.gyp:ppapi_cpp',
+      ],
+      'sources': [
+        'examples/flash_topmost/flash_topmost.cc',
+      ],
+    },
   ],
 }