Add a simple dmg script to the mac build dir to build a dmg out of the app....

build/mac/build_app_dmg

+#!/bin/sh
+
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Normally you don't want to build a dmg out of a debug build.
+if [ "${CONFIGURATION}" != "Release" ] ; then
+  echo "warning: building dmg in non-release mode" >&2
+fi
+
+# Make sure we got the branding passed to us
+if [ $# -ne 1 ]; then
+  echo "error: missing branding as an argument" >&2
+  exit 1
+fi
+
+# fail on anything from here out
+set -ex

[Mark Mentovai, 2009/05/08 20:18:22]

Maybe don't set -x 'til you call pkg-dmg.  We don't really care to display
what's being assinged, do we?  Same goes for -e because the sets can't really
fail.

+
+TOP="${SRCROOT}/.."
+PKG_DMG="${TOP}/build/mac/pkg-dmg"
+
+APP_NAME=$1
+SRC_APP_PATH="${BUILT_PRODUCTS_DIR}/${APP_NAME}.app"
+VOL_NAME="${APP_NAME}"
+# Do we want a svn version in the DMG name?
+DMG_NAME="${APP_NAME}.dmg"
+DST_DMG_PATH="${BUILT_PRODUCTS_DIR}/${DMG_NAME}"
+
+# Call the real working
+"${PKG_DMG}" --source /var/empty \
+             --target "${DST_DMG_PATH}" \
+             --format UDBZ \
+             --volname "${VOL_NAME}" \
+             --tempdir "${TEMP_DIR}" \
+             --copy "${SRC_APP_PATH}/:/${APP_NAME}.app/"