[AiS] Add a new AutocompleteMatchType for Answers in Suggest.

chrome/common/autocomplete_match_type.h

 // Copyright 2013 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_COMMON_AUTOCOMPLETE_MATCH_TYPE_H_
 #define CHROME_COMMON_AUTOCOMPLETE_MATCH_TYPE_H_
 
 #include <string>
 
 struct AutocompleteMatchType {
@@ skipping 23 matching lines @@
     SEARCH_SUGGEST_PROFILE      = 12,  // A personalized suggested search for a
                                        // Google+ profile.
     SEARCH_OTHER_ENGINE         = 13,  // A search with a non-default engine.
     EXTENSION_APP               = 14,  // An Extension App with a title/url that
                                        // contains the input.
     CONTACT_DEPRECATED          = 15,  // One of the user's contacts
                                        // (deprecated).
     BOOKMARK_TITLE              = 16,  // A bookmark whose title contains the
                                        // input.
     NAVSUGGEST_PERSONALIZED     = 17,  // A personalized suggestion URL.
+    SEARCH_SUGGEST_ANSWER       = 18,  // A short result for a suggested search.
     NUM_TYPES,
   };
 
   // Converts |type| to a string representation. Used in logging.
   static std::string ToString(AutocompleteMatchType::Type type);
 };
 
 #endif  // CHROME_COMMON_AUTOCOMPLETE_MATCH_TYPE_H_