Cache `tools/lint.py` results.

Change-Id: Id9ca69583796e202f68dad847ef640824146fd59
diff --git a/tools/test.py b/tools/test.py
index 48f3166..34c8983 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -319,10 +319,10 @@
 
 
 def RunLinter():
-  rc, default_tracked_files = lint.GetDefaultTrackedFiles()
+  rc, default_tracked_files = lint.GetDefaultFilesToLint()
   if rc:
     return rc
-  return lint.LintFiles(map(lambda x: join(dir_root, x), default_tracked_files),
+  return lint.RunLinter(map(lambda x: join(dir_root, x), default_tracked_files),
                         jobs = args.jobs, progress_prefix = 'cpp lint: ')