cc: Ban DLOG/LOG(INFO) from cc via presubmit

cc/PRESUBMIT.py

Index: cc/PRESUBMIT.py
diff --git a/cc/PRESUBMIT.py b/cc/PRESUBMIT.py
index c876419762ee6f29a0460154974d855b69e0ca98..1c3613aa045ad63d60e4d58adf9f062abfebde01 100644
--- a/cc/PRESUBMIT.py
+++ b/cc/PRESUBMIT.py
@@ -38,9 +38,28 @@ def CheckAsserts(input_api, output_api, white_list=CC_SOURCE_FILES, black_list=N
       items=notreached_files)]
   return []
 
+def CheckSpamLogging(input_api, output_api, white_list=CC_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x, white_list, black_list)
+
+  bad_files = []
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if re.search(r"\bD?LOG\s*\(\s*INFO\s*\)", contents):
+      bad_files.append(f.LocalPath())
+
+  if bad_files:
+    return [output_api.PresubmitError(
+      'These files spam the console log with LOG(INFO):',
+      items=bad_files)]
+  return []
+
+
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results += CheckAsserts(input_api, output_api)
+  results += CheckSpamLogging(input_api, output_api)
   return results
 
 def GetPreferredTrySlaves(project, change):