[Depot Tools] add agents presubmit

add CheckSkillFiles and CheckSkillValidatorTestsOnCommit for presubmit


Change-Id: Ia5123ce92660c3b44dcc7b4083b305abde19076a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7707574
Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Erik Staab <estaab@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Ziwen Lin <ziwlin@microsoft.com>

PRESUBMIT.py

@@ -221,3 +221,19 @@ def CheckFreezeOnCommit(input_api, output_api):
 
 def CheckAyeAye(input_api, output_api):
     return input_api.canned_checks.CheckAyeAye(input_api, output_api)
+
+
+def CheckSkillFiles(input_api, output_api):
+    """Validates SKILL.md files have correct frontmatter and formatting."""
+    return input_api.canned_checks.CheckSkillFiles(input_api, output_api)
+
+
+def CheckSkillValidatorTestsOnCommit(input_api, output_api):
+    """Runs skill-validator tests on commit."""
+    tests = input_api.canned_checks.GetUnitTestsInDirectory(
+        input_api,
+        output_api,
+        input_api.os_path.join('agents', 'skills', 'skill-validator',
+                               'scripts'),
+        files_to_check=[r'.*test\.py$'])
+    return input_api.RunTests(tests)