Add Android fonts to blimp engine

blimp/engine/Dockerfile

 FROM ubuntu:trusty
 
 # Run the command below to update the lib list.
 # ldd ./blimp_engine_app | grep usr/lib | awk '{print $3}' | xargs -n1 \
 #   dpkg-query -S | awk -F: '{print $1}' | sort | uniq
 RUN apt-get update && \
   apt-get install -yq libdrm2 libfontconfig1 libfreetype6 libgraphite2-3 \
   libharfbuzz0b libnspr4 libnss3 libstdc++6
 
 RUN apt-get install -yq stunnel4
 
 RUN mkdir /engine
 
 RUN useradd -ms /bin/bash blimp_user
 
+# The glob below expands to all files, but does not add directories
+# recursively.
 ADD * /engine/
+ADD gen/blimp/fonts /engine/fonts
 RUN mv /engine/chrome_sandbox /engine/chrome-sandbox
 RUN chown -R blimp_user /engine
 
 USER blimp_user
 WORKDIR "/engine"
 
 ENTRYPOINT ["/engine/start_engine.sh"]
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