Add a class to parse answer json.

components/omnibox/autocomplete_match.h

Index: components/omnibox/autocomplete_match.h
diff --git a/components/omnibox/autocomplete_match.h b/components/omnibox/autocomplete_match.h
index cb1f6e4258f80a00e0c0b861ca15e0ecfdeef475..9e5da3ca4507ae006c363fb2c259baf6f8d24355 100644
--- a/components/omnibox/autocomplete_match.h
+++ b/components/omnibox/autocomplete_match.h
@@ -11,6 +11,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "components/omnibox/autocomplete_match_type.h"
+#include "components/omnibox/suggestion_answer.h"
 #include "components/search_engines/template_url.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
@@ -317,9 +318,12 @@ struct AutocompleteMatch {
   base::string16 description;
   ACMatchClassifications description_class;
 
+  // TODO(jdonnelly): Remove the first two properties once the downstream
+  // clients are using the SuggestionAnswer.
   // A rich-format version of the display for the dropdown.
   base::string16 answer_contents;
   base::string16 answer_type;
+  SuggestionAnswer answer;
 
   // The transition type to use when the user opens this match.  By default
   // this is TYPED.  Providers whose matches do not look like URLs should set