Import SQLite 3.7.6.3.

third_party/sqlite/webdb.patch

 The WebDatabase implementation in the renderer users a custom vfs to
 broker file open and other requests.  This modifies the built-in vfs
 implementation to let that code share much of the implementation
 details.
 
 diff --git src/os_unix.c src/os_unix.c
 index ef04a72..e5e1509 100644
 --- src/os_unix.c
 +++ src/os_unix.c
 @@ -3496,9 +3496,16 @@ typedef const sqlite3_io_methods *(*finder_type)(const char*,unixFile*);
@@ skipping 24 matching lines @@
 +  memset(file, 0, sizeof(unixFile));
 +}
 +
 +int chromium_sqlite3_fill_in_unix_sqlite3_file(sqlite3_vfs* vfs,
 +                                               int fd,
 +                                               int dirfd,
 +                                               sqlite3_file* file,
 +                                               const char* fileName,
 +                                               int noLock,
 +                                               int isDelete) {
-+  return fillInUnixFile(vfs, fd, dirfd, file, fileName, noLock, isDelete);
++  return fillInUnixFile(vfs, fd, dirfd, file, fileName, noLock, isDelete, 0);
 +}
 +
 +/*
 +** Search for an unused file descriptor that was opened on the database file.
 +** If a suitable file descriptor if found, then it is stored in *fd; otherwise,
 +** *fd is not modified.
 +**
 +** If a reusable file descriptor is not found, and a new UnixUnusedFd cannot
 +** be allocated, SQLITE_NOMEM is returned. Otherwise, SQLITE_OK is returned.
 +*/
@@ skipping 98 matching lines @@
  }
  
 +void chromium_sqlite3_initialize_win_sqlite3_file(sqlite3_file* file, HANDLE handle) {
 +  winFile* winSQLite3File = (winFile*)file;
 +  memset(file, 0, sizeof(*file));
 +  winSQLite3File->pMethod = &winIoMethod;
 +  winSQLite3File->h = handle;
 +}
 +
  #endif /* SQLITE_OS_WIN */