Add LoggingSeekFile

util/file/file_io_posix.cc

Index: util/file/file_io_posix.cc
diff --git a/util/file/file_io_posix.cc b/util/file/file_io_posix.cc
index 8681ad8dade067b8cbdd23cc1311730d167f04e0..fbfdad0837368d776b51b55a8372a3400fb166d9 100644
--- a/util/file/file_io_posix.cc
+++ b/util/file/file_io_posix.cc
@@ -98,6 +98,12 @@ FileHandle LoggingOpenFileForWrite(const base::FilePath& path,
   return fd;
 }
 
+FileOffset LoggingSeekFile(FileHandle file, FileOffset offset, int whence) {
+  off_t rv = lseek(file, offset, whence);
+  PLOG_IF(ERROR, rv < 0) << "lseek";
+  return rv;
+}
+
 bool LoggingCloseFile(FileHandle file) {
   int rv = IGNORE_EINTR(close(file));
   PLOG_IF(ERROR, rv != 0) << "close";