Add a class to parse answer json.

components/omnibox/autocomplete_match.h

 // Copyright 2014 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 COMPONENTS_OMNIBOX_AUTOCOMPLETE_MATCH_H_
 #define COMPONENTS_OMNIBOX_AUTOCOMPLETE_MATCH_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "components/omnibox/autocomplete_match_type.h"
 #include "components/search_engines/template_url.h"
 #include "ui/base/page_transition_types.h"
 #include "url/gurl.h"
 
 class AutocompleteProvider;
+class SuggestionAnswer;
 class TemplateURL;
 class TemplateURLService;
 
 namespace base {
 class Time;
 }  // namespace base
 
 const char kACMatchPropertyInputText[] = "input text";
 const char kACMatchPropertyContentsPrefix[] = "match contents prefix";
 const char kACMatchPropertyContentsStartIndex[] = "match contents start index";
@@ skipping 282 matching lines @@
 
   // The main text displayed in the address bar dropdown.
   base::string16 contents;
   ACMatchClassifications contents_class;
 
   // Additional helper text for each entry, such as a title or description.
   base::string16 description;
   ACMatchClassifications description_class;
 
   // A rich-format version of the display for the dropdown.
   base::string16 answer_contents;

[groby-ooo-7-16, 2014/10/21 00:35:54]

Since we make answer optional, I think we should put contents/type into
SuggestionAnswer as well. (Also, we can probably remove contents as soon as we
can move SuggestionAnswer to the Java side)

[Justin Donnelly, 2014/10/21 21:43:54]

Agreed.  Once I update Clank to use the new type, I'll remove the contents and
type fields.  (I already had a TODO in SuggestResult and I've added one here in
AutocompleteMatch.)  I already put type into answer.  It's not clear that we'll
actually need a string contents field, but I can add it later if necessary.

   base::string16 answer_type;
+  scoped_ptr<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
   // it to GENERATED.
   ui::PageTransition transition;
 
   // True when this match is the "what you typed" match from the history
   // system.
   bool is_history_what_you_typed_match;
 
@@ skipping 47 matching lines @@
       const base::string16& text,
       const ACMatchClassifications& classifications) const;
 #endif
 };
 
 typedef AutocompleteMatch::ACMatchClassification ACMatchClassification;
 typedef std::vector<ACMatchClassification> ACMatchClassifications;
 typedef std::vector<AutocompleteMatch> ACMatches;
 
 #endif  // COMPONENTS_OMNIBOX_AUTOCOMPLETE_MATCH_H_