[test] Only run presubmit for changed status files

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 1c161cb25e831b87744cbeef49fe79283e5303e0..8321f5cedfd67e9151c8b022025a032403f7552e 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -67,7 +67,7 @@ def _V8PresubmitChecks(input_api, output_api):
         input_api.PresubmitLocalPath(), 'tools'))
   from presubmit import CppLintProcessor
   from presubmit import SourceProcessor
-  from presubmit import CheckStatusFiles
+  from presubmit import StatusFilesProcessor
 
   results = []
   if not CppLintProcessor().RunOnFiles(
@@ -78,7 +78,8 @@ def _V8PresubmitChecks(input_api, output_api):
     results.append(output_api.PresubmitError(
         "Copyright header, trailing whitespaces and two empty lines " \
         "between declarations check failed"))
-  if not CheckStatusFiles(input_api.PresubmitLocalPath()):
+  if not StatusFilesProcessor().RunOnFiles(
+      input_api.AffectedFiles(include_deletes=False)):
     results.append(output_api.PresubmitError("Status file check failed"))
   results.extend(input_api.canned_checks.CheckAuthorizedAuthor(
       input_api, output_api))