PPAPI: Add dev synchronous JS->Plugin messaging API

ppapi/tests/all_c_includes.h

 /* 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.
  *
  * This test simply includes all the C headers to ensure they compile with a C
  * compiler.  If it compiles, it passes.
  */
 #ifndef PPAPI_TESTS_ALL_C_INCLUDES_H_
 #define PPAPI_TESTS_ALL_C_INCLUDES_H_
 
@@ skipping 82 matching lines @@
 #include "ppapi/c/ppb_url_response_info.h"
 #include "ppapi/c/ppb_var_array.h"
 #include "ppapi/c/ppb_var_array_buffer.h"
 #include "ppapi/c/ppb_var_dictionary.h"
 #include "ppapi/c/ppb_video_frame.h"
 #include "ppapi/c/ppb_websocket.h"
 #include "ppapi/c/ppp.h"
 #include "ppapi/c/ppp_graphics_3d.h"
 #include "ppapi/c/ppp_input_event.h"
 #include "ppapi/c/ppp_instance.h"
+#include "ppapi/c/ppp_message_handler.h"
 #include "ppapi/c/ppp_messaging.h"
 #include "ppapi/c/ppp_mouse_lock.h"
 #include "ppapi/c/private/pp_private_font_charset.h"
 #include "ppapi/c/private/pp_video_frame_private.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
 #include "ppapi/c/private/ppb_display_color_profile_private.h"
 #include "ppapi/c/private/ppb_ext_crx_file_system_private.h"
 #include "ppapi/c/private/ppb_file_io_private.h"
 #include "ppapi/c/private/ppb_find_private.h"
 #include "ppapi/c/private/ppb_flash.h"
@@ skipping 16 matching lines @@
 #include "ppapi/c/private/ppb_uma_private.h"
 #include "ppapi/c/private/ppb_video_destination_private.h"
 #include "ppapi/c/private/ppb_video_source_private.h"
 #include "ppapi/c/private/ppb_x509_certificate_private.h"
 #include "ppapi/c/private/ppp_content_decryptor_private.h"
 #include "ppapi/c/private/ppp_find_private.h"
 #include "ppapi/c/private/ppp_instance_private.h"
 #include "ppapi/c/trusted/ppb_url_loader_trusted.h"
 
 #endif  /* PPAPI_TESTS_ALL_C_INCLUDES_H_ */