Import SQLite 3.8.7.4.

third_party/sqlite/src/ext/misc/vfslog.c

 /*
 ** 2013-10-09
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
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 }
 
 /*
 ** Register debugvfs as the default VFS for this process.
 */
 int sqlite3_register_vfslog(const char *zArg){
   vlog_vfs.pVfs = sqlite3_vfs_find(0);
   vlog_vfs.base.szOsFile = sizeof(VLogFile) + vlog_vfs.pVfs->szOsFile;
   return sqlite3_vfs_register(&vlog_vfs.base, 1);
 }