Allow extensions on chrome:// URLs, when flag is set and permission is explicitly requested

extensions/common/url_pattern.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 EXTENSIONS_COMMON_URL_PATTERN_H_
 #define EXTENSIONS_COMMON_URL_PATTERN_H_
 
 #include <functional>
 #include <string>
 #include <vector>
 
@@ skipping 170 matching lines @@
   class EffectiveHostCompareFunctor {
    public:
     bool operator()(const URLPattern& a, const URLPattern& b) const {
       return EffectiveHostCompare(a, b);
     };
   };
 
   // Get an error string for a ParseResult.
   static const char* GetParseResultString(URLPattern::ParseResult parse_result);
 
+  // Checks whether the bit is set for the given scheme in the given scheme mask
+  static bool IsSchemeBitSet(const std::string& scheme, const int mask);
+
  private:
   // Returns true if any of the |schemes| items matches our scheme.
   bool MatchesAnyScheme(const std::vector<std::string>& schemes) const;
 
   // Returns true if all of the |schemes| items matches our scheme.
   bool MatchesAllSchemes(const std::vector<std::string>& schemes) const;
 
   bool MatchesSecurityOriginHelper(const GURL& test) const;
 
   // Returns true if our port matches the |port| pattern (it may be "*").
   bool MatchesPortPattern(const std::string& port) const;
 
   // If the URLPattern contains a wildcard scheme, returns a list of
   // equivalent literal schemes, otherwise returns the current scheme.
   std::vector<std::string> GetExplicitSchemes() const;
 
   // A bitmask containing the schemes which are considered valid for this
   // pattern. Parse() uses this to decide whether a pattern contains a valid
-  // scheme. MatchesScheme uses this to decide whether a wildcard scheme_
-  // matches a given test scheme.
+  // scheme.
   int valid_schemes_;
 
   // True if this is a special-case "<all_urls>" pattern.
   bool match_all_urls_;
 
   // The scheme for the pattern.
   std::string scheme_;
 
   // The host without any leading "*" components.
   std::string host_;
@@ skipping 13 matching lines @@
   // MatchPattern() function.
   std::string path_escaped_;
 
   // A string representing this URLPattern.
   mutable std::string spec_;
 };
 
 typedef std::vector<URLPattern> URLPatternList;
 
 #endif  // EXTENSIONS_COMMON_URL_PATTERN_H_