Add a class to parse answer json.

chrome/browser/autocomplete/search_provider_unittest.cc

 // Copyright 2012 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 "components/omnibox/search_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 3400 matching lines @@
 
   // Without scored results, no answers will be retrieved.
   AnswersQueryData answer = provider_->FindAnswersPrefetchData();
   EXPECT_TRUE(answer.full_query_text.empty());
   EXPECT_TRUE(answer.query_type.empty());
 
   // Inject a scored result, which will trigger answer retrieval.
   base::string16 query = base::ASCIIToUTF16("weather los angeles");
   SearchSuggestionParser::SuggestResult suggest_result(
       query, AutocompleteMatchType::SEARCH_HISTORY, query, base::string16(),
-      base::string16(), base::string16(), base::string16(), std::string(),
-      std::string(), false, 1200, false, false, query);
+      base::string16(), base::string16(), base::string16(), nullptr,
+      std::string(), std::string(), false, 1200, false, false, query);
   QueryForInput(ASCIIToUTF16("weather l"), false, false);
   provider_->transformed_default_history_results_.push_back(suggest_result);
   answer = provider_->FindAnswersPrefetchData();
   EXPECT_EQ(base::ASCIIToUTF16("weather los angeles"), answer.full_query_text);
   EXPECT_EQ(base::ASCIIToUTF16("2334"), answer.query_type);
 }
 
 TEST_F(SearchProviderTest, RemoveExtraAnswers) {
   ACMatches matches;
   AutocompleteMatch match1, match2, match3, match4, match5;
@@ skipping 15 matching lines @@
   EXPECT_EQ(base::ASCIIToUTF16("42"), matches[0].answer_type);
   EXPECT_TRUE(matches[1].answer_contents.empty());
   EXPECT_TRUE(matches[1].answer_type.empty());
   EXPECT_TRUE(matches[2].answer_contents.empty());
   EXPECT_TRUE(matches[2].answer_type.empty());
   EXPECT_TRUE(matches[3].answer_contents.empty());
   EXPECT_TRUE(matches[3].answer_type.empty());
   EXPECT_TRUE(matches[4].answer_contents.empty());
   EXPECT_TRUE(matches[4].answer_type.empty());
 }