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

chrome/common/autocomplete_match_type.cc

 // 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.
 
 #include "chrome/common/autocomplete_match_type.h"
 
 #include "base/basictypes.h"
 
 // static
 std::string AutocompleteMatchType::ToString(AutocompleteMatchType::Type type) {
   const char* strings[] = {
     "url-what-you-typed",
     "history-url",
     "history-title",
     "history-body",
     "history-keyword",
     "navsuggest",
     "search-what-you-typed",
     "search-history",
     "search-suggest",
     "search-suggest-entity",
     "search-suggest-infinite",
     "search-suggest-personalized",
     "search-suggest-profile",
     "search-other-engine",
     "extension-app",
     "contact",
     "bookmark-title",
     "navsuggest-personalized",
+    "search-suggest-answer",
   };
   COMPILE_ASSERT(arraysize(strings) == AutocompleteMatchType::NUM_TYPES,
                  strings_array_must_match_type_enum);
   return strings[type];
 }