Add libpoppler for PDF rendering, take 2

third_party/fontconfig/README.chromium

Index: third_party/fontconfig/README.chromium
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+Name: fontconfig
+Short Name: fontconfig
+URL: git://anongit.freedesktop.org/fontconfig
+Version: 2.10.93
+License: MIT, except for Windows-specific files, which are LGPL
+License File: LICENSE
+Security Critical: No
+
+Description:
+A library for configuring and customizing font access.
+Used in Skia as a dependency of libpoppler, for PDF rasterization during
+testing.
+
+Local Modifications:
+No changes to files from the upstream repository.
+Platform-specific configuration files added to
+third_party/fontconfig/config/(platform):
+  config.h
+  fcstdint.h
+  src/fcalias.h
+  src/fcaliastail.h
+  src/fcftalias.h
+  src/fcftaliastail.h
+  These are Windows replacements for POSIX headers:
+    dirent.c
+    dirent.h
+    unistd.h
+
+Autogenerated files (consistent across platforms) added to
+third_party/fontconfig/config:
+  fc-case/fccase.h
+  fc-glyphname/fcglyphname.h
+  fc-lang/fclang.h
+  src/fcobjshash.h
+
+On Linux and Mac, these are the files generated by ./configure, with no
+additional flags.
+On Windows, the configuration files were from
+http://comments.gmane.org/gmane.comp.fonts.fontconfig/4438
+(fontconfig development list).
+