Initialize MockInputApi's verbosity

With this change, the input api's verbosity is set up by looking for
the '--verbose' argument.

credit: approach was recommended by brucedawson@.

Bug: None
Change-Id: I1e71dc2f798d63e2391496d885467787738b5168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4247059
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1104813}

PRESUBMIT_test_mocks.py

@@ -80,6 +80,10 @@ class MockInputApi(object):
     self.presubmit_local_path = os.path.dirname(__file__)
     self.is_windows = sys.platform == 'win32'
     self.no_diffs = False
+    # Although this makes assumptions about command line arguments used by test
+    # scripts that create mocks, it is a convenient way to set up the verbosity
+    # via the input api.
+    self.verbose = '--verbose' in sys.argv
 
   def CreateMockFileInPath(self, f_list):
     self.os_path.exists = lambda x: x in f_list

build/ios/presubmit_support_test.py

@@ -20,7 +20,6 @@ class BundleDataPresubmit(unittest.TestCase):
         os.path.dirname(__file__), '..', '..')
     self.mock_input_api.PresubmitLocalPath = lambda: os.path.dirname(__file__)
     self.mock_output_api = MockOutputApi()
-    self.mock_input_api.verbose = False
 
   def testBasic(self):
     """