Add SwiftShader libraries to Linux installer package.

chrome/installer/linux/common/installer.include

 # Recursively replace @@include@@ template variables with the referenced file,
 # and write the resulting text to stdout.
 process_template_includes() {
   INCSTACK+="$1->"
   # Includes are relative to the file that does the include.
   INCDIR=$(dirname $1)
   # Clear IFS so 'read' doesn't trim whitespace
   local OLDIFS="$IFS"
   IFS=''
   while read -r LINE
@@ skipping 151 matching lines @@
     install -m 644 -s "${BUILDDIR}/libwidevinecdmadapter.so" "${STAGEDIR}/${INSTALLDIR}/"
     install -m 644 "${BUILDDIR}/libwidevinecdm.so" "${STAGEDIR}/${INSTALLDIR}/"
   fi
 
   # ANGLE
   if [ "${CHANNEL}" != "stable" ]; then
     install -m 644 "${BUILDDIR}/libGLESv2.so" "${STAGEDIR}/${INSTALLDIR}/"
     install -m 644 "${BUILDDIR}/libEGL.so" "${STAGEDIR}/${INSTALLDIR}/"
   fi
 
+  # SwiftShader
+  if [ -f "${BUILDDIR}/swiftshader/libEGL.so" ]; then

[mmoss, 2017/05/08 22:49:29]

Unlike the ANGLE files above, this applies to all channels? Any idea why ANGLE
doesn't apply to stable?

+    install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+    install -m 644 "${BUILDDIR}/swiftshader/libEGL.so" "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+    install -m 644 "${BUILDDIR}/swiftshader/libGLESv2.so" "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+  fi
+
   # libc++
   if [ -f "${BUILDDIR}/lib/libc++.so" ]; then
     install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/lib/"
 
     install -m 644 -s "${BUILDDIR}/lib/libc++.so" "${STAGEDIR}/${INSTALLDIR}/lib/"
   fi
 
 
   # nacl_helper and nacl_helper_bootstrap
   # Don't use "-s" (strip) because this runs binutils "strip", which
@@ skipping 64 matching lines @@
     "${STAGEDIR}/usr/share/gnome-control-center/default-apps/${PACKAGE}.xml"
   chmod 644 "${STAGEDIR}/usr/share/gnome-control-center/default-apps/${PACKAGE}.xml"
   process_template "${BUILDDIR}/installer/common/default-app-block.template" \
     "${STAGEDIR}${INSTALLDIR}/default-app-block"
   chmod 644 "${STAGEDIR}${INSTALLDIR}/default-app-block"
 
   # documentation
   install -m 755 "${BUILDDIR}/${PROGNAME}.1" \
     "${STAGEDIR}/usr/share/man/man1/${PACKAGE}.1"
 }