Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/tools/ftfuzzer/README

Index: third_party/freetype2/src/src/tools/ftfuzzer/README
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+ftfuzzer
+========
+
+
+ftfuzzer.cc
+-----------
+
+This file contains a target function  for FreeType fuzzing.  It can be
+used    with   libFuzzer    (http://llvm.org/docs/LibFuzzer.html)   or
+potentially any other similar fuzzer.
+
+Usage:
+
+  1. Build  `libfreetype.a' and  `ftfuzzer.cc' using  the most  recent
+     clang compiler with these flags:
+
+       # for fuzzer coverage feedback
+       -fsanitize-coverage=edge,8bit-counters
+       # for bug checking
+       -fsanitize=address,signed-integer-overflow,shift
+
+     You  also need  the header  files from  the `libarchive'  library
+     (http://www.libarchive.org/)  for handling  tar  files (see  file
+     `ftmutator.cc' below for more).
+
+  2. Link with `libFuzzer' (it contains `main') and `libarchive'.
+
+  3. Run the fuzzer on some test corpus.
+
+The exact flags and commands may vary.
+
+
+There is a continuous fuzzing bot that runs ftfuzzer.
+
+  https://github.com/google/libfuzzer-bot/tree/master/freetype
+
+Check the bot configuration for the most current settings.
+
+
+ftmutator.cc
+------------
+
+FreeType has the  ability to `attach' auxiliary files to  a font file,
+providing additional information.  The main usage is to load AFM files
+for PostScript Type 1 fonts.
+
+However, libFuzzer currently only supports  mutation of a single input
+file.   For  this  reason,  `ftmutator.cc' contains  a  custom  fuzzer
+mutator that uses an uncompressed tar  file archive as the input.  The
+first file in  such a tarball gets  opened by FreeType as  a font, all
+other files are treated as input for `FT_Attach_Stream'.
+
+Compilation is similar to `ftfuzzer.c'.
+
+
+runinput.cc
+-----------
+
+To run the target function on a set of input files, this file contains
+a   convenience  `main'   function.   Link   it  with   `ftfuzzer.cc',
+`libfreetype.a', and `libarchive' and run like
+
+  ./a.out my_tests_inputs/*
+
+----------------------------------------------------------------------
+
+Copyright 2015 by
+David Turner, Robert Wilhelm, and Werner Lemberg.
+
+This  file is  part of  the FreeType  project, and  may only  be used,
+modified,  and distributed  under the  terms of  the  FreeType project
+license,  LICENSE.TXT.  By  continuing to  use, modify,  or distribute
+this file you  indicate that you have read  the license and understand
+and accept it fully.
+
+
+--- end of README ---