Add libpoppler PDF rasterizer

third_party/poppler/README.chromium

Index: third_party/poppler/README.chromium
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+Name: libpoppler
+Short Name: libpoppler
+URL: git://git.freedesktop.org/git/poppler/poppler
+Version: poppler-0.22.5 (upstream Git repo tag)
+License: GPLv2 / GPLv3
+License File: NOT_SHIPPED
+Security Critical: No
+
+Description:
+A PDF rendering library, currently used in the Skia gm for regression-testing PDF output.
+This should ONLY be used for tesing code.
+
+Local Modifications:
+No changes to files from the upstream repository.
+
+Platform-specific configuration files added to third_party/poppler/(platform):
+  config.h
+  poppler/poppler-config.h
+  cpp/poppler-version.h
+
+On Linux and Mac, these are the files generated by ./configure, using these flags:
+./configure --disable-libopenjpeg --disable-libtiff --disable-largefile --disable-libjpeg --disable-libpng --disable-cairo-output --disable-poppler-glib --disable-poppler-qt4 --disable-gtk-test --disable-utils 
+On Windows, these are the files generated with CMake and selecting a minimal feature set.
+