Add pyl files to generate the tests config.

The config is only added for the bot luci.webrtc.ci:"Linux64 Release" as a proof of concept.

Bug: webrtc:13899
Change-Id: I5ac37da5f63ca4b1c346dffe43e635b2c55e0c01
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/257160
Reviewed-by: Christoffer Jansson <jansson@google.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#36417}

infra/specs/PRESUBMIT.py

@@ -0,0 +1,43 @@
+# Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+
+def _HasLocalChanges(input_api):
+  ret = input_api.subprocess.call(['git', 'diff', '--quiet'])
+  return ret != 0
+
+
+def CheckPatchFormatted(input_api, output_api):
+  results = []
+  file_filter = lambda x: x.LocalPath().endswith('.pyl')
+  affected_files = input_api.AffectedFiles(include_deletes=False,
+                                           file_filter=file_filter)
+
+  for f in affected_files:
+    cmd = ['yapf', '-i', f.AbsoluteLocalPath()]
+    if input_api.subprocess.call(cmd):
+      results.append(output_api.PresubmitError('Error calling "' + cmd + '"'))
+
+  if _HasLocalChanges(input_api):
+    msg = ('Diff found after running "yapf -i" on modified .pyl files.\n'
+           'Please commit or discard the new changes.')
+    results.append(output_api.PresubmitError(msg))
+
+  return results
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  results = []
+  results.extend(CheckPatchFormatted(input_api, output_api))
+  return results
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  results = []
+  results.extend(CheckPatchFormatted(input_api, output_api))
+  return results