Adding performance tests for HQP that represent importance of optimising HistoryItemsForTerms method

components/omnibox/browser/in_memory_url_index.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.
 
 #ifndef COMPONENTS_OMNIBOX_BROWSER_IN_MEMORY_URL_INDEX_H_
 #define COMPONENTS_OMNIBOX_BROWSER_IN_MEMORY_URL_INDEX_H_
 
 #include <stddef.h>
 
 #include <functional>
@@ skipping 29 matching lines @@
 class BookmarkModel;
 }
 
 namespace in_memory_url_index {
 class InMemoryURLIndexCacheItem;
 }
 
 namespace history {
 class HistoryDatabase;
 class HistoryService;
+class HQPPerfTestBase;
 }
 
 class URLIndexPrivateData;
 
 typedef std::set<std::string> SchemeSet;
 
 // The URL history source.
 // Holds portions of the URL database in memory in an indexed form.  Used to
 // quickly look up matching URLs for a given query string.  Used by
 // the HistoryURLProvider for inline autocomplete and to provide URL
@@ skipping 81 matching lines @@
     save_cache_observer_ = save_cache_observer;
   }
 
   // Indicates that the index restoration is complete.
   bool restored() const {
     return restored_;
   }
 
  private:
   friend class ::HistoryQuickProviderTest;
+  friend class history::HQPPerfTestBase;
   friend class InMemoryURLIndexTest;
   friend class InMemoryURLIndexCacheTest;
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, ExpireRow);
   FRIEND_TEST_ALL_PREFIXES(LimitedInMemoryURLIndexTest, Initialization);
 
   // HistoryDBTask used to rebuild our private data from the history database.
   class RebuildPrivateDataFromHistoryDBTask : public history::HistoryDBTask {
    public:
     explicit RebuildPrivateDataFromHistoryDBTask(
         InMemoryURLIndex* index, const SchemeSet& scheme_whitelist);
@@ skipping 154 matching lines @@
   // This flag is set to true if we want to listen to the
   // HistoryServiceLoaded Notification.
   bool listen_to_history_service_loaded_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(InMemoryURLIndex);
 };
 
 #endif  // COMPONENTS_OMNIBOX_BROWSER_IN_MEMORY_URL_INDEX_H_