Add --dry_run to presubmit_support.

presubmit_canned_checks.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 import os as _os
 _HERE = _os.path.dirname(_os.path.abspath(__file__))
 
 # Justifications for each filter:
@@ skipping 841 matching lines @@
         long_text='\n'.join(out))]
   return []
 
 
 def CheckOwners(input_api, output_api, source_file_filter=None):
   if input_api.is_committing:
     if input_api.tbr:
       return [output_api.PresubmitNotifyResult(
           '--tbr was specified, skipping OWNERS check')]
     if input_api.change.issue:
-      if _GetRietveldIssueProps(input_api, None).get('cq_dry_run', False):
+      if (input_api.dry_run or
+        # TODO(tandrii): clean below once CQ && run_presubmit.py recipe specify
+        # dry_run property. http://crbug.com/605563.
+        _GetRietveldIssueProps(input_api, None).get('cq_dry_run', False)):
         return [output_api.PresubmitNotifyResult(
-            'This is a CQ dry run, skipping OWNERS check')]
+            'This is a dry run, skipping OWNERS check')]
     else:
       return [output_api.PresubmitError("OWNERS check failed: this change has "
           "no Rietveld issue number, so we can't check it for approvals.")]
     needed = 'LGTM from an OWNER'
     output = output_api.PresubmitError
   else:
     needed = 'OWNER reviewers'
     output = output_api.PresubmitNotifyResult
 
   affected_files = set([f.LocalPath() for f in
       input_api.change.AffectedFiles(file_filter=source_file_filter)])
 
   owners_db = input_api.owners_db
+  # TODO(tandrii): this will always return None, set() in case of Gerrit.
   owner_email, reviewers = _RietveldOwnerAndReviewers(
       input_api,
       owners_db.email_regexp,
       approval_needed=input_api.is_committing)
 
   owner_email = owner_email or input_api.change.author_email
 
   if owner_email:
     reviewers_plus_owner = set([owner_email]).union(reviewers)
     missing_files = owners_db.files_not_covered_by(affected_files,
@@ skipping 239 matching lines @@
   for f in affected_files:
     cmd = ['gn', 'format', '--dry-run', f.AbsoluteLocalPath()]
     rc = gn.main(cmd)
     if rc == 2:
       warnings.append(output_api.PresubmitPromptWarning(
           '%s requires formatting. Please run `gn format --in-place %s`.' % (
               f.AbsoluteLocalPath(), f.LocalPath())))
   # It's just a warning, so ignore other types of failures assuming they'll be
   # caught elsewhere.
   return warnings