[GCM] Adding last token fetching time handling

components/gcm_driver/gcm_client.h

Index: components/gcm_driver/gcm_client.h
diff --git a/components/gcm_driver/gcm_client.h b/components/gcm_driver/gcm_client.h
index 7552bbe00a2d4bf97fd38b800554063f770a9e93..dbd386f792085cdbf1a2db49dcca24fa28c16900 100644
--- a/components/gcm_driver/gcm_client.h
+++ b/components/gcm_driver/gcm_client.h
@@ -203,8 +203,10 @@ class GCMClient {
     // from the server if it hadn't yet.
     // |account_mappings|: a persisted list of accounts mapped to this GCM
     //                     client.
+    // |last_token_fetching_time|: a timestamp of a last successful token fetch.
     virtual void OnGCMReady(
-        const std::vector<AccountMapping>& account_mappings) = 0;
+        const std::vector<AccountMapping>& account_mappings,
+        const base::Time& last_token_fetching_time) = 0;
 
     // Called when activities are being recorded and a new activity has just
     // been recorded.
@@ -295,6 +297,9 @@ class GCMClient {
   // Removes the account mapping related to |account_id| from the persistent
   // store.
   virtual void RemoveAccountMapping(const std::string& account_id) = 0;
+
+  // Sets last token fetching time in persistent store.
+  virtual void SetLastTokenFetchingTime(const base::Time& time) = 0;
 };
 
 }  // namespace gcm