Add a script to update Breakpad from SVN (no bug). r=me

toolkit/crashreporter/update-breakpad.sh

@@ -0,0 +1,27 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Usage: update-breakpad.sh <path to breakpad SVN>
+
+if [ $# -lt 1 ]; then
+  echo "Usage: update-breakpad.sh /path/to/google-breakpad/"
+  exit 1
+fi
+
+crashreporter_dir=`dirname $0`
+repo=${crashreporter_dir}/../..
+rm -rf ${crashreporter_dir}/google-breakpad
+svn export $1 ${crashreporter_dir}/google-breakpad
+
+# remove some extraneous bits
+rm -rf ${crashreporter_dir}/google-breakpad/src/third_party/protobuf ${crashreporter_dir}/google-breakpad/src/testing/ ${crashreporter_dir}/google-breakpad/src/tools/gyp/
+# restore our Makefile.ins
+hg -R ${repo} st -n | grep "Makefile\.in$" | xargs hg revert --no-backup
+# and some other makefiles
+hg -R ${repo} st -n | grep "objs\.mk$" | xargs hg revert --no-backup
+
+# Record `svn info`
+svn info $1 > ${crashreporter_dir}/google-breakpad/SVN-INFO
+
+hg addremove ${crashreporter_dir}/google-breakpad/