[AiS] Provide Answers queries with a session token.

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 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.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all autocomplete entries that start with "Search <engine>
 // for ...", including searching for the current input string, search
 // history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
@@ skipping 48 matching lines @@
 
  private:
   friend class SearchProviderTest;
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, CanSendURL);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInline);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInlineDomainClassify);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, NavigationInlineSchemeSubstring);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, RemoveStaleResultsTest);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, SuggestRelevanceExperiment);
   FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, TestDeleteMatch);
+  FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, SuggestQueryUsesToken);
+  FRIEND_TEST_ALL_PREFIXES(SearchProviderTest, SessionToken);
   FRIEND_TEST_ALL_PREFIXES(AutocompleteProviderTest, GetDestinationURL);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedPrefetchTest, ClearPrefetchedResults);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedPrefetchTest, SetPrefetchQuery);
 
   // Manages the providers (TemplateURLs) used by SearchProvider. Two providers
   // may be used:
   // . The default provider. This corresponds to the user's default search
   //   engine. This is always used, except for the rare case of no default
   //   engine.
   // . The keyword provider. This is used if the user has typed in a keyword.
@@ skipping 184 matching lines @@
                                    bool is_keyword,
                                    bool use_aggressive_method,
                                    bool prevent_search_history_inlining) const;
 
   // Returns an AutocompleteMatch for a navigational suggestion.
   AutocompleteMatch NavigationToMatch(const NavigationResult& navigation);
 
   // Updates the value of |done_| from the internal state.
   void UpdateDone();
 
+  // Obtains a session token, regenerating if necessary.
+  std::string GetSessionToken();
+
   // The amount of time to wait before sending a new suggest request after the
   // previous one.  Non-const because some unittests modify this value.
   static int kMinimumTimeBetweenSuggestQueriesMs;
 
   // Maintains the TemplateURLs used.
   Providers providers_;
 
   // The user's input.
   AutocompleteInput input_;
 
@@ skipping 14 matching lines @@
   // Fetchers used to retrieve results for the keyword and default providers.
   scoped_ptr<net::URLFetcher> keyword_fetcher_;
   scoped_ptr<net::URLFetcher> default_fetcher_;
 
   // Results from the default and keyword search providers.
   Results default_results_;
   Results keyword_results_;
 
   GURL current_page_url_;
 
+  // Session token management.
+  std::string current_token_;
+  base::TimeTicks token_expiration_time_;
+
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_