[ios] Wait for sync query to return before displaying history

ios/chrome/browser/ui/history/history_service_facade.h

 // Copyright 2016 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 IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SERVICE_FACADE_H_
 #define IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SERVICE_FACADE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 28 matching lines @@
 class HistoryServiceFacade : public history::HistoryServiceObserver {
  public:
   // Represents the result of a query to history service.
   struct QueryResult {
     QueryResult();
     QueryResult(const QueryResult&);
     ~QueryResult();
     base::string16 query;
     base::string16 query_start_time;
     base::string16 query_end_time;
+    // true if all local history from History service has been retrieved.
     bool finished;
+    // true if a query to WebHistoryService has returned successfully.
+    bool sync_returned;
+    // true if results from WebHistoryService have been retrieved.
     bool has_synced_results;
+    // true if all remote history from WebHistoryService has been retrieved.
     bool sync_finished;
     std::vector<history::HistoryEntry> entries;
   };
 
   // Represents a history entry removed by the client.
   struct RemovedEntry {
     RemovedEntry(const GURL& url, const base::Time& timestamp);
     RemovedEntry(const GURL& url, const std::vector<base::Time>& timestamps);
     RemovedEntry(const RemovedEntry&);
     ~RemovedEntry();
@@ skipping 100 matching lines @@
 
   // Delegate for HistoryServiceFacade. Serves as client for HistoryService.
   base::WeakNSProtocol<id<HistoryServiceFacadeDelegate>> delegate_;
 
   base::WeakPtrFactory<HistoryServiceFacade> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryServiceFacade);
 };
 
 #endif  // IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_SERVICE_FACADE_H_