Add a histogram for omnibox answer suggestion types.

components/omnibox/browser/search_suggestion_parser.cc

Index: components/omnibox/browser/search_suggestion_parser.cc
diff --git a/components/omnibox/browser/search_suggestion_parser.cc b/components/omnibox/browser/search_suggestion_parser.cc
index 32f7e5fee69d8139a8105a3d57358a6a2dc2d667..04e10a02ba461d6d5b8f60b09e06c229b207673a 100644
--- a/components/omnibox/browser/search_suggestion_parser.cc
+++ b/components/omnibox/browser/search_suggestion_parser.cc
@@ -524,6 +524,8 @@ bool SearchSuggestionParser::ParseSuggestResults(
             answer = SuggestionAnswer::ParseAnswer(answer_json);
             int answer_type = 0;
             if (answer && base::StringToInt(answer_type_str, &answer_type)) {
+              UMA_HISTOGRAM_SPARSE_SLOWLY("Omnibox.AnswerParseType",
+                                          answer_type);
               answer_parsed_successfully = true;
 
               answer->set_type(answer_type);