Add cc/ to banned_directories in chromium clang style checker

tools/clang/plugins/ChromeClassTester.cpp

 // 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.
 
 // A general interface for filtering and only acting on classes in Chromium C++
 // code.
 
 #include "ChromeClassTester.h"
 
 #include <sys/param.h>
@@ skipping 19 matching lines @@
 bool ends_with(const std::string& one, const std::string& two) {
   if (two.size() > one.size())
     return false;
 
   return one.compare(one.size() - two.size(), two.size(), two) == 0;
 }
 
 }  // namespace
 
 ChromeClassTester::ChromeClassTester(CompilerInstance& instance,
-                                     bool check_inner_classes)
+                                     bool check_inner_classes,
+                                     bool check_cc_directory)
     : instance_(instance),
       diagnostic_(instance.getDiagnostics()),
-      check_inner_classes_(check_inner_classes) {
+      check_inner_classes_(check_inner_classes),
+      check_cc_directory_(check_cc_directory) {
   BuildBannedLists();
 }
 
 ChromeClassTester::~ChromeClassTester() {}
 
 void ChromeClassTester::HandleTagDeclDefinition(TagDecl* tag) {
   if (check_inner_classes_) {
     // Defer processing of this tag until its containing top-level
     // declaration has been fully parsed. See crbug.com/136863.
     pending_class_decls_.push_back(tag);
@@ skipping 102 matching lines @@
   banned_directories_.push_back("ppapi/");
   banned_directories_.push_back("usr/");
   banned_directories_.push_back("testing/");
   banned_directories_.push_back("googleurl/");
   banned_directories_.push_back("v8/");
   banned_directories_.push_back("dart/");
   banned_directories_.push_back("sdch/");
   banned_directories_.push_back("icu4c/");
   banned_directories_.push_back("frameworks/");
 
+  if (!check_cc_directory_)
+    banned_directories_.push_back("cc/");
+
   // Don't check autogenerated headers.
   // Make puts them below $(builddir_name)/.../gen and geni.
   // Ninja puts them below OUTPUT_DIR/.../gen
   // Xcode has a fixed output directory for everything.
   banned_directories_.push_back("gen/");
   banned_directories_.push_back("geni/");
   banned_directories_.push_back("xcodebuild/");
 
   // You are standing in a mazy of twisty dependencies, all resolved by
   // putting everything in the header.
@@ skipping 117 matching lines @@
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
 
   *filename = ploc.getFilename();
   return true;
 }