Dump a new CSV with warning messages

Bug: 171068870
Test: manual
Change-Id: Ibb528940daf9a6cd99ece8e5a63d67aacdfc131c
diff --git a/tools/warn/warn_common.py b/tools/warn/warn_common.py
index 68ed995..b2dd8ab 100755
--- a/tools/warn/warn_common.py
+++ b/tools/warn/warn_common.py
@@ -77,6 +77,9 @@
                       help='Save CSV warning file to the passed path')
   parser.add_argument('--gencsv', action='store_true',
                       help='Generate CSV file with number of various warnings')
+  parser.add_argument('--csvwithdescription', default='',
+                      help="""Save CSV warning file to the passed path this csv
+                            will contain all the warning descriptions""")
   parser.add_argument('--byproject', action='store_true',
                       help='Separate warnings in HTML output by project names')
   parser.add_argument('--url', default='',