[Suggestions Service] Add support for expiring the SuggestionsStore

components/suggestions/suggestions_service.h

Index: components/suggestions/suggestions_service.h
diff --git a/components/suggestions/suggestions_service.h b/components/suggestions/suggestions_service.h
index ee1ed92ca6afa4f288d455684c805d8aef3cb87b..16c201b8a10c63cc3050c6c9840afccbcc7ad78e 100644
--- a/components/suggestions/suggestions_service.h
+++ b/components/suggestions/suggestions_service.h
@@ -45,6 +45,8 @@ extern const char kSuggestionsFieldTrialStateParam[];
 extern const char kSuggestionsFieldTrialControlParam[];
 extern const char kSuggestionsFieldTrialStateEnabled[];
 
+extern const int64 kDefaultExpiryUsec;
+
 // An interface to fetch server suggestions asynchronously.
 class SuggestionsService : public KeyedService, public net::URLFetcherDelegate {
  public:
@@ -92,6 +94,9 @@ class SuggestionsService : public KeyedService, public net::URLFetcherDelegate {
   // Register SuggestionsService related prefs in the Profile prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
+  // Sets default timestamp for suggestions which do not have expiry timestamp.
+  void SetDefaultExpiryTimestamps(SuggestionsProfile* suggestions,

[Mathieu, 2014/08/04 19:54:55]

nit: rename to SetDefaultExpiryTimestamp

[gayane -on leave until 09-2017, 2014/08/05 14:39:15]

Done.

+                                  int64 timestamp_usec);
  private:
   FRIEND_TEST_ALL_PREFIXES(SuggestionsServiceTest, BlacklistURLFails);
   FRIEND_TEST_ALL_PREFIXES(SuggestionsServiceTest, FetchSuggestionsData);