Check in a simple pure-python based Markdown previewer.

third_party/Python-Markdown/README.chromium

Index: third_party/Python-Markdown/README.chromium
diff --git a/third_party/Python-Markdown/README.chromium b/third_party/Python-Markdown/README.chromium
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+Name: Python-Markdown
+URL: https://pypi.python.org/packages/source/M/Markdown/Markdown-2.6.2.tar.gz#md5=256d19afcc564dc4ce4c229bb762f7ae
+Version: 2.6.2
+Revision: None
+Security Critical: no
+License: BSD
+License File: NOT_SHIPPED
+
+Description:
+
+Python-Markdown is a pure Python parser for Markdown.
+
+//tools/md_browser uses it to provide a local previewer for our
+Markdown-based documentation.
+
+This code is not considered security critical since it is only used by
+developer utilities. This should never be linked into chrome or any production
+code.
+
+To update this, do something roughly along the lines of:
+
+    cd ..
+    wget $URL # A newer version of the above URL
+    tar xvzf Markdown-$VERSION.tar.gz
+    cd Markdown-$VERSION
+    rm -fr bin docs INSTALL.md makefile MANIFEST PKG-INFO \
+           run-tests.py setup.py tests tox.ini
+    cp ../Python-Markdown/README.chromium .
+
+    # update the version numbers in README.chromium
+
+    cd ..
+    rm -fr Python-Markdown
+    mv Markdown-$VERSION Python-Markdown