Pepper: Add append support to FileIO.

ppapi/api/ppb_file_io.idl

Index: ppapi/api/ppb_file_io.idl
diff --git a/ppapi/api/ppb_file_io.idl b/ppapi/api/ppb_file_io.idl
index f89ba171c10bd6c73749cab9f79e6d92b924555d..87fca84c6cd44047b409d40a8d1a62feb8a6e39e 100644
--- a/ppapi/api/ppb_file_io.idl
+++ b/ppapi/api/ppb_file_io.idl
@@ -41,14 +41,20 @@ label Chrome {
    * 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,
+  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>.
+  */

[dmichael (off chromium), 2013/06/11 20:02:22]

I think it would be good to comment that this is only valid to use as of version
1.2, which is supported in Chrome 29 and later. I think we can avoid having more
than 1 enum type defined.

+  PP_FILEOPENFLAG_APPEND = 1 << 5
 };