Add a new entry to omnibox_event.proto to log specific type of contextual suggestions

components/omnibox/browser/search_suggestion_parser.h

Index: components/omnibox/browser/search_suggestion_parser.h
diff --git a/components/omnibox/browser/search_suggestion_parser.h b/components/omnibox/browser/search_suggestion_parser.h
index 9a1ddd49ba43f86bf67ebe083cfad6a6ae62872e..23eedbe846757f96fc0c65dd4c19f6aa2048bcc0 100644
--- a/components/omnibox/browser/search_suggestion_parser.h
+++ b/components/omnibox/browser/search_suggestion_parser.h
@@ -201,12 +201,17 @@ class SearchSuggestionParser {
                      bool from_keyword_provider,
                      int relevance,
                      bool relevance_from_server,
-                     const base::string16& input_text);
+                     const base::string16& input_text,
+                     const std::string& zero_suggest_specific_type);
+    NavigationResult(const NavigationResult& nav);
     ~NavigationResult() override;
 
     const GURL& url() const { return url_; }
     const base::string16& description() const { return description_; }
     const base::string16& formatted_url() const { return formatted_url_; }
+    const std::string& zero_suggest_specific_type() const {
+      return zero_suggest_specific_type_;
+    }
 
     // Fills in |match_contents_| and |match_contents_class_| to reflect how
     // the URL should be displayed and bolded against the current |input_text|.
@@ -229,6 +234,10 @@ class SearchSuggestionParser {
 
     // The suggested navigational result description; generally the site name.
     base::string16 description_;
+
+    // If this suggestion is a zero suggest suggestion, this will be set to the
+    // specific subtype of the result.
+    std::string zero_suggest_specific_type_;
   };
 
   typedef std::vector<SuggestResult> SuggestResults;