[WIP] histroy: Adjust cache size OnMemoryStateChange()

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"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "components/history/core/browser/download_database.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/history/core/browser/url_database.h"
 #include "components/history/core/browser/visit_database.h"
 #include "components/history/core/browser/visitsegment_database.h"
+#include "components/memory_coordinator/common/memory_coordinator_client.h"
 #include "sql/connection.h"
 #include "sql/init_status.h"
 #include "sql/meta_table.h"
 
 #if defined(OS_ANDROID)
 #include "components/history/core/browser/android/android_cache_database.h"
 #include "components/history/core/browser/android/android_urls_database.h"
 #endif
 
 namespace base {
@@ skipping 106 matching lines @@
   bool RecreateAllTablesButURL();
 
   // Vacuums the database. This will cause sqlite to defragment and collect
   // unused space in the file. It can be VERY SLOW.
   void Vacuum();
 
   // Try to trim the cache memory used by the database.  If |aggressively| is
   // true try to trim all unused cache, otherwise trim by half.
   void TrimMemory(bool aggressively);
 
+  // Adjusts the cache memory used by the database.
+  void AdjustCacheMemory(memory_coordinator::MemoryState state);
+
   // Razes the database. Returns true if successful.
   bool Raze();
 
   std::string GetDiagnosticInfo(int extended_error, sql::Statement* statement);
 
   // Visit table functions ----------------------------------------------------
 
   // Update the segment id of a visit. Return true on success.
   bool SetSegmentID(VisitID visit_id, SegmentID segment_id);
 
@@ skipping 41 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_