Disable WPTServe flaky tests on PY3. They fail when run as part of the entire suite

Bug: 1308877
Change-Id: I2bc6becc6fc0ada41260644bd812f436ae9bd12b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3540715
Reviewed-by: Weizhong Xia <[email protected]>
Commit-Queue: Preethi Mohan <[email protected]>
Cr-Commit-Position: refs/heads/main@{#983555}

Author: preethimm

third_party/blink/tools/blinkpy/web_tests/servers/wptserve_unittest.py

@@ -5,6 +5,7 @@
 import json
 import logging
 import six
+import unittest
 
 from blinkpy.common.host_mock import MockHost
 from blinkpy.common.system.log_testing import LoggingTestCase
@@ -81,6 +82,10 @@ def test_prepare_config(self):
             'local-dir': '/mock-checkout/out/Release/gen'
         })
 
+    @unittest.skipIf(
+        six.PY3,
+        'This test is flaky when run as part of the suite. See crbug.com/1308877'
+    )
     def test_start_with_stale_pid(self):
         # Allow asserting about debug logs.
         self.set_logging_level(logging.DEBUG)
@@ -111,6 +116,10 @@ def test_start_with_stale_pid(self):
         self.assertEqual(logs[-1],
                          'DEBUG: wptserve successfully started (pid = 42)\n')
 
+    @unittest.skipIf(
+        six.PY3,
+        'This test is flaky when run as part of the suite. See crbug.com/1308877'
+    )
     def test_start_with_unkillable_zombie_process(self):
         # Allow asserting about debug logs.
         self.set_logging_level(logging.DEBUG)