autocomplete: Add AutocompleteMatch::MergeClassifications()

chrome/browser/autocomplete/autocomplete_match.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 CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 126 matching lines @@
   // Similar to ClassifyMatchInString(), but for cases where the range to mark
   // as matching is already known (avoids calling find()).  This can be helpful
   // when find() would be misleading (e.g. you want to mark the second match in
   // a string instead of the first).
   static void ClassifyLocationInString(size_t match_location,
                                        size_t match_length,
                                        size_t overall_length,
                                        int style,
                                        ACMatchClassifications* classifications);
 
+  // Returns a new vector of classifications containing the merged contents of
+  // |classifications1| and |classifications2|.
+  static ACMatchClassifications MergeClassifications(
+      const ACMatchClassifications& classifications1,
+      const ACMatchClassifications& classifications2);
+
   // Converts classifications to and from a serialized string representation
   // (using comma-separated integers to sequentially list positions and styles).
   static std::string ClassificationsToString(
       const ACMatchClassifications& classifications);
   static ACMatchClassifications ClassificationsFromString(
       const std::string& serialized_classifications);
 
   // Adds a classification to the end of |classifications| iff its style is
   // different from the last existing classification.  |offset| must be larger
   // than the offset of the last classification in |classifications|.
@@ skipping 162 matching lines @@
       const string16& text,
       const ACMatchClassifications& classifications) const;
 #endif
 };
 
 typedef AutocompleteMatch::ACMatchClassification ACMatchClassification;
 typedef std::vector<ACMatchClassification> ACMatchClassifications;
 typedef std::vector<AutocompleteMatch> ACMatches;
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_