Add change to enable getting safe build of chrome

src/scripts/build_platform_packages.sh

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Script must be run inside the chroot
 assert_inside_chroot
 
 # Flags
+DEFINE_boolean stable $FLAGS_FALSE "Build with stable version of browser."
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
 # Die on error
 set -e
 
 # Number of jobs for scons calls.
 NUM_JOBS=`cat /proc/cpuinfo | grep processor | awk '{a++} END {print a}'`
 
 PLATFORM_DIR="$SRC_ROOT/platform"
 
 PLATFORM_DIRS="acpi assets fake_hal init installer login_manager \
                memento_softwareupdate pam_google window_manager \
                cros chrome screenlocker cryptohome \
                monitor_reconfig"
 
 THIRD_PARTY_DIR="$SRC_ROOT/third_party"
 THIRD_PARTY_PACKAGES="connman e2fsprogs/files gflags gtest \
                       ply-image slim/src synaptics \
                       wpa_supplicant xscreensaver/xscreensaver-5.08 \
                       xserver-xorg-core xserver-xorg-video-intel"
 
+if [ $FLAGS_stable -eq $FLAGS_TRUE ]
+then
+  # Passed to copy_chrome_zip.sh to get stable version of the browser
+  export GET_STABLE_CHROME=1
+fi
+
 # Build third_party packages first, since packages and libs depend on them.
 for i in $THIRD_PARTY_PACKAGES
 do
   echo "Building package ${i}..."
   cd "$THIRD_PARTY_DIR/$i"
   ./make_pkg.sh
   cd -
 done
 
 # Build base lib next, since packages depend on it.
@@ skipping 11 matching lines @@
 # Build platform packages
 for i in $PLATFORM_DIRS
 do
   echo "Building package ${i}..."
   cd "$PLATFORM_DIR/$i"
   ./make_pkg.sh
   cd -
 done
 
 echo "All packages built."