Update the clang plugin to optionally enforce rules for Blink code.

tools/clang/plugins/ChromeClassTester.h

 // 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.
 
 #ifndef TOOLS_CLANG_PLUGINS_CHROMECLASSTESTER_H_
 #define TOOLS_CLANG_PLUGINS_CHROMECLASSTESTER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 67 matching lines @@
   bool IsIgnoredType(const std::string& base_name);
 
   // Attempts to determine the filename for the given SourceLocation.
   // Returns false if the filename could not be determined.
   bool GetFilename(clang::SourceLocation loc, std::string* filename);
 
   clang::CompilerInstance& instance_;
   clang::DiagnosticsEngine& diagnostic_;
 
   // List of banned namespaces.
-  std::vector<std::string> banned_namespaces_;
+  std::set<std::string> banned_namespaces_;
+
+  // List of directories allowed even though their parent directories are in
+  // |banned_directories_|, below.
+  std::set<std::string> allowed_directories_;
 
   // List of banned directories.
-  std::vector<std::string> banned_directories_;
+  std::set<std::string> banned_directories_;
 
   // List of types that we don't check.
   std::set<std::string> ignored_record_names_;
 
   // List of decls to check once the current top-level decl is parsed.
   std::vector<clang::TagDecl*> pending_class_decls_;
 };
 
 #endif  // TOOLS_CLANG_PLUGINS_CHROMECLASSTESTER_H_