cc: Ban (f)printf via presubmit.py

cc/PRESUBMIT.py

Index: cc/PRESUBMIT.py
diff --git a/cc/PRESUBMIT.py b/cc/PRESUBMIT.py
index 1c3613aa045ad63d60e4d58adf9f062abfebde01..319d3b5234469fda2acd4114ac8b5bc7905f9913 100644
--- a/cc/PRESUBMIT.py
+++ b/cc/PRESUBMIT.py
@@ -11,6 +11,7 @@ details on the presubmit API built into gcl.
 import re
 
 CC_SOURCE_FILES=(r'^cc/.*\.(cc|h)$',)
+CC_PERF_TEST =(r'^.*_perftest.*\.(cc|h)$',)
 
 def CheckAsserts(input_api, output_api, white_list=CC_SOURCE_FILES, black_list=None):
   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
@@ -42,24 +43,31 @@ def CheckSpamLogging(input_api, output_api, white_list=CC_SOURCE_FILES, black_li
   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 = []
+  log_info = []
+  printf = []
 
   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())
+      log_info.append(f.LocalPath())
+    if re.search(r"\bf?printf\(", contents):
+      printf.append(f.LocalPath())
 
-  if bad_files:
+  if log_info:
     return [output_api.PresubmitError(
       'These files spam the console log with LOG(INFO):',
-      items=bad_files)]
+      items=log_info)]
+  if printf:
+    return [output_api.PresubmitError(
+      'These files spam the console log with printf/fprintf:',
+      items=printf)]
   return []
 
 
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results += CheckAsserts(input_api, output_api)
-  results += CheckSpamLogging(input_api, output_api)
+  results += CheckSpamLogging(input_api, output_api, black_list=CC_PERF_TEST)
   return results
 
 def GetPreferredTrySlaves(project, change):