crash-reporter: Capture and send recent update_engine logs when it crashes

crash_reporter_logs.conf

Index: crash_reporter_logs.conf
diff --git a/crash_reporter_logs.conf b/crash_reporter_logs.conf
new file mode 100644
index 0000000000000000000000000000000000000000..5ae82a21ddc3616c91bf3c776276d9d320c7fb82
--- /dev/null
+++ b/crash_reporter_logs.conf
@@ -0,0 +1,22 @@
+# Copyright (c) 2010 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.
+
+# This file has the format:
+# <basename>:<shell command>\n
+#
+# Where when any executable with the basename <basename> crashes, the
+# given <shell command> is executed and its standard output and
+# standard error is sent along with the crash report.
+#
+# Use caution in modifying this file.  Only run common unix commands
+# here as these commands will be run when a crash has recently
+# occurred and we should avoid running anything that might cause
+# another crash.  Similarly these command block the notification of
+# the crash to parent processes, so commands should execute quickly.
+#
+update_engine:cat $(ls -1tr /var/log/update_engine | tail -5 | sed s.^./var/log/update_engine/.) | tail -c 50000
+
+# The following rules are only for testing purposes.
+crash_log_test:echo hello world
+crash_log_recursion_test:sleep 1 && /home/autotest/tests/crash_log_recursion_test