Migrate dartium_tools from chrome branch to dart repo

tools/dartium/print_dart_version.sh

+#!/bin/bash
+
+# Print svn revisions for Dartium internal repositories.  The output
+# is included in each Dartium archive build / release.
+#
+# This script is necessary because Dartium maintains its own branches
+# of Chromium and WebKit.  This script is for temporary use only; it
+# will not be integrated back into Chromium.
+
+function version() {
+  if [ $(svnversion) == exported ]
+  then
+    # git-svn
+    git svn info | grep Revision | cut -c 11-
+  else
+    # svn
+    echo $(svnversion)
+  fi
+}
+
+root_dir=$(dirname $0)/../..
+pushd ${root_dir} > /dev/null
+echo dartium-chromium: $(version)
+cd third_party/WebKit
+echo dartium-webkit: $(version)
+cd ../../dart/runtime
+echo dartium-runtime: $(version)
+popd > /dev/null