[Perf] Python 3 migration: Fix -v option

Some Python scripts check the -v option with "options.verbosity >= 2".
When -v is not specified, options.verbosity equals None. With Python 2,
"None >= 2" is allowed and returns False, but in Python 3 it throws a
TypeError. This is fixed by setting options.verbosity to default to 0.

Bug: 1199156
Change-Id: Ia9c360388b787e5fac65bc59ab6669fea86d99d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2838549
Auto-Submit: John Chen <johnchen@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#874356}

tools/perf/core/find_dependencies.py

@@ -194,7 +194,7 @@ class FindDependenciesCommand(command_line.OptparseCommand):
   @classmethod
   def AddCommandLineArgs(cls, parser, _):
     parser.add_option(
-        '-v', '--verbose', action='count', dest='verbosity',
+        '-v', '--verbose', action='count', dest='verbosity', default=0,
         help='Increase verbosity level (repeat as needed).')
 
     parser.add_option(

tools/perf/core/results_processor/command_line.py

@@ -27,7 +27,7 @@ def ArgumentParser(standalone=False):
     all_output_formats.append('none')
   parser, group = _CreateTopLevelParser(standalone)
   parser.add_argument(
-      '-v', '--verbose', action='count', dest='verbosity',
+      '-v', '--verbose', action='count', dest='verbosity', default=0,
       help='Increase verbosity level (repeat as needed)')
   group.add_argument(
       '--output-format', action='append', dest='output_formats',

tools/perf/fetch_benchmark_deps.py

@@ -96,7 +96,7 @@ def main(args):
   parser.add_argument('--output-deps',
                       help=('Output dependencies to a json file'))
   parser.add_argument(
-        '-v', '--verbose', action='count', dest='verbosity',
+        '-v', '--verbose', action='count', dest='verbosity', default=0,
         help='Increase verbosity level (repeat as needed)')
 
   options = parser.parse_args(args)