Pepper: Add append support to FileIO.

ppapi/c/ppb_file_io.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.
  */
 
-/* From ppb_file_io.idl modified Fri Nov 16 10:46:53 2012. */
+/* From ppb_file_io.idl modified Tue Jun 11 12:14:29 2013. */
 
 #ifndef PPAPI_C_PPB_FILE_IO_H_
 #define PPAPI_C_PPB_FILE_IO_H_
 
 #include "ppapi/c/pp_array_output.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_file_info.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
@@ skipping 36 matching lines @@
   /**
    * Requests that the file be truncated to length 0 if it exists and is a
    * regular file. <code>PP_FILEOPENFLAG_WRITE</code> must also be specified.
    */
   PP_FILEOPENFLAG_TRUNCATE = 1 << 3,
   /**
    * Requests that the file is created when this flag is combined with
    * <code>PP_FILEOPENFLAG_CREATE</code>.  If this flag is specified, and the
    * file already exists, then the FileIO::Open() call will fail.
    */
-  PP_FILEOPENFLAG_EXCLUSIVE = 1 << 4
+  PP_FILEOPENFLAG_EXCLUSIVE = 1 << 4,
+  /**
+   * Requests write access to a file, but writes will always occur at the end of
+   * the file. Mututally exclusive with <code>PP_FILEOPENFLAG_WRITE</code>.
+   */
+  PP_FILEOPENFLAG_APPEND = 1 << 5
 } PP_FileOpenFlags;
 PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_FileOpenFlags, 4);
 /**
  * @}
  */
 
 /**
  * @addtogroup Interfaces
  * @{
  */
@@ skipping 241 matching lines @@
                        struct PP_CompletionCallback callback);
   int32_t (*Flush)(PP_Resource file_io, struct PP_CompletionCallback callback);
   void (*Close)(PP_Resource file_io);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_FILE_IO_H_ */