Update zlib to 1.2.11

third_party/zlib/README.chromium

Index: third_party/zlib/README.chromium
diff --git a/third_party/zlib/README.chromium b/third_party/zlib/README.chromium
index ea58bd7d9abab3fd220ad8b6acfb046ab0b3dd0f..fe6bc105db4cbe1182b2df77cab9f644f53ae5ad 100644
--- a/third_party/zlib/README.chromium
+++ b/third_party/zlib/README.chromium
@@ -1,43 +1,28 @@
 Name: zlib
+Short Name: zlib
 URL: http://zlib.net/
-Version: 1.2.8
+Version: 1.2.11
 Security Critical: yes
 License: Custom license
+License File: LICENSE
 License Android Compatible: yes
 
 Description:
-General purpose compression library
+"A massively spiffy yet delicately unobtrusive compression library."
 
-Local Modifications:
-A few minor changes, all marked with "Google":
-- Added #ifdefs to avoid compile warnings when NO_GZCOMPRESS is defined.
-- Removed use of strerror for WinCE in gzio.c.
-- Added 'int z_errno' global for WinCE, to which 'errno' is defined in zutil.h.
-- Added 'mozzconf.h' to mangle the function names.
-- Added logic in zlib.h to undef our earlier mangles when defaulting to 64 bit offset versions of API.
-- Added casts to suppress VC++ warnings
-The 'google.patch' file represents our changes from the original zlib-1.2.5.
-
-Integrated Intel SIMD optimisations from: https://github.com/jtkukunas/zlib/
-and modified to accomodate the older version and existing changes in tree.
-
-This introduces new files: simd_stub.c, crc_folding.c, fill_window_sse.c and
-x86.[ch]. All but the latter are built into a static library to allow the
-compiler to use the desired instructions only when valid. The latter version is
-only built on x86 (32-bit and 64-bit) systems with it's functionality stubbed
-on the others.
+zlib is a free, general-purpose, legally unencumbered lossless data-compression
+library. zlib implements the "deflate" compression algorithm described by RFC
+1951, which combines the LZ77 (Lempel-Ziv) algorithm with Huffman coding. zlib
+also implements the zlib (RFC 1950) and gzip (RFC 1952) wrapper formats.
 
-Other changes to accomodate:
-- fill_window() implementation calls into _sse() variant when supported and the
-  original implementation renamed to _c()
-- read_buf was moved from local to ZLIB_INTERNAL for fill_window_sse.c to use
-- INSERT_STRING macro was made a function, insert_string() and an implementation using CRC instruction added
-- some crc funcionality moved into crc32.c
-
-Update to zlib-1.2.8, generate a third patch which includes the jtkukunas optimisations. We may merge some more from jtkukunas branch later.
-Currently we upgrade to madler's version 1.2.8,merged SIMD optimisation and
-some other changes above.
-The step as follows:
-1.download a clean madler zlib from github.
-2.apply google.patch, simd.patch sequencely.
-3.update these patches.
+Local Modifications:
+ - Only source code from the zlib distribution used to build the zlib and
+   minizip libraries are present. Many other files have been omitted. Only *.c
+   and *.h files from the upstream root directory and contrib/minizip were
+   imported.
+ - The contents of the google directory are original Chromium-specific
+   additions.
+ - google.patch contains changes from the upstream version, mostly related to
+   the build.
+ - Intel SIMD optimisations from https://github.com/jtkukunas/zlib/ have been
+   integrated. These changes are reflected in simd.patch.