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

components/history/core/browser/history_database.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_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_
 
 #include <stddef.h>
 
 #include "base/compiler_specific.h"
@@ skipping 150 matching lines @@
   // early expiration (AUTO_SUBFRAMES).
   virtual base::Time GetEarlyExpirationThreshold();
   virtual void UpdateEarlyExpirationThreshold(base::Time threshold);
 
  private:
 #if defined(OS_ANDROID)
   // AndroidProviderBackend uses the |db_|.
   friend class AndroidProviderBackend;
   FRIEND_TEST_ALL_PREFIXES(AndroidURLsMigrationTest, MigrateToVersion22);
 #endif
-  friend class ::HistoryQuickProviderTest;
   friend class ::InMemoryURLIndexTest;
 
   // Overridden from URLDatabase:
   sql::Connection& GetDB() override;
 
   // Migration -----------------------------------------------------------------
 
   // Makes sure the version is up to date, updating if necessary. If the
   // database is too old to migrate, the user will be notified. Returns
   // sql::INIT_OK iff  the DB is up to date and ready for use.
@@ skipping 14 matching lines @@
   sql::MetaTable meta_table_;
 
   base::Time cached_early_expiration_threshold_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryDatabase);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DATABASE_H_