Added authorized install with a script to do the copy.

chrome/installer/mac/app/copy_to_disk.sh

Index: chrome/installer/mac/app/copy_to_disk.sh
diff --git a/chrome/installer/mac/app/copy_to_disk.sh b/chrome/installer/mac/app/copy_to_disk.sh
new file mode 100755
index 0000000000000000000000000000000000000000..152666eb69dbb330ad969d32fac3ada17a82bbb6
--- /dev/null
+++ b/chrome/installer/mac/app/copy_to_disk.sh
@@ -0,0 +1,26 @@
+#!/bin/sh -pe
+
+# Copyright 2016 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.
+
+# This script will be called by the main application to copy the chrome app
+# into the /Applciations folder. This script assumes it is running as root and
+# will only be called if the program obtains root permissions.
+#
+# When running as root, this script will be invoked with the real user ID set
+# to the user's ID, but the effective user ID set to 0 (root).  bash -p is
+# used on the first line to prevent bash from setting the effective user ID to
+# the real user ID (dropping root privileges).
+
+# Lets this program start but hang until parent process gives it input
+# as a flag to continue.
+read -n 1

[ivanhernandez, 2016/08/16 17:18:39]

We want to authenticate as soon as the program launches but we don't want to
this script to run until later. This is my "solution" to this problem. The main
program will feed this program input when its ready to copy stuff and thus
unblock this script. Im not sure if this is a duct tape solution or if it is
viable for the final product.

[Anna Zeng, 2016/08/18 15:57:16]

Minor correction: "... but we don't want this script..."

Also, could using `wait` work?
http://stackoverflow.com/questions/13296863/difference-between-wait-and-sleep...
It's a bit less hack-like but seems a bit less intuitive how we could use it.

[ivanhernandez, 2016/08/22 15:34:49]

Hmm seems like 'wait' would need for another process to finish. Which means we
would need two subprocesses in this program. Doesn't seem ideal.

+
+SRC=${1}
+DEST=${2}
+FULL_DEST=${3}
+
+rsync -lrpt "${SRC}" "${DEST}" >& /dev/null
+chown -Rh root:admin "${FULL_DEST}" >& /dev/null
+chmod -R a+rX,ug+w,o-w  "${FULL_DEST}" >& /dev/null