A proposal and implementation for an initial postMessage interface. These in...

ppapi/ppapi_cpp.gypi

 # Copyright (c) 2010 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_c',
       'type': 'none',
       'all_dependent_settings': {
@@ skipping 46 matching lines @@
         'c/dev/ppb_file_chooser_dev.h',
         'c/dev/ppb_file_io_dev.h',
         'c/dev/ppb_file_io_trusted_dev.h',
         'c/dev/ppb_file_ref_dev.h',
         'c/dev/ppb_file_system_dev.h',
         'c/dev/ppb_find_dev.h',
         'c/dev/ppb_font_dev.h',
         'c/dev/ppb_font_list_dev.h',
         'c/dev/ppb_fullscreen_dev.h',
         'c/dev/ppb_graphics_3d_dev.h',
+        'c/dev/ppb_messaging_dev.h',
         'c/dev/ppb_opengles_dev.h',
         'c/dev/ppb_scrollbar_dev.h',
         'c/dev/ppb_surface_3d_dev.h',
         'c/dev/ppb_testing_dev.h',
         'c/dev/ppb_transport_dev.h',
         'c/dev/ppb_url_util_dev.h',
         'c/dev/ppb_video_decoder_dev.h',
         'c/dev/ppb_widget_dev.h',
         'c/dev/ppb_zoom_dev.h',
         'c/dev/ppp_cursor_control_dev.h',
         'c/dev/ppp_find_dev.h',
         'c/dev/ppp_graphics_3d_dev.h',
+        'c/dev/ppp_messaging_dev.h',
         'c/dev/ppp_scrollbar_dev.h',
         'c/dev/ppp_selection_dev.h',
         'c/dev/ppp_printing_dev.h',
         'c/dev/ppp_widget_dev.h',
         'c/dev/ppp_zoom_dev.h',
 
         # Private interfaces.
         'c/private/ppb_flash.h',
         'c/private/ppb_flash_clipboard.h',
         'c/private/ppb_flash_file.h',
@@ skipping 156 matching lines @@
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
   ],
 }