Add type hinting to blink unexpected passes

Adds type hinting information to the Blink unexpected pass finder and
adds a new pytype suite to analyze it.

Bug: 1315354
Change-Id: Ief3bef485063799917d435d0d417dfe3f4a3d307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3784460
Reviewed-by: Weizhong Xia <[email protected]>
Reviewed-by: Ben Pastene <[email protected]>
Commit-Queue: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1028892}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 318caef..c11350d8 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -220,6 +220,11 @@
       },
     },
   },
+  'blink_pytype': {
+    'remove_from': [
+      'linux-code-coverage',
+    ],
+  },
   'blink_unittests': {
     'modifications': {
       'fuchsia-code-coverage': {