[WIP] histroy: Adjust cache size OnMemoryStateChange()

components/history/core/browser/history_database.h

Index: components/history/core/browser/history_database.h
diff --git a/components/history/core/browser/history_database.h b/components/history/core/browser/history_database.h
index 0eb74a571afab422235df12a447b0039371290e6..6e7a8140a607a24d7de9f3659950ac7578291a4c 100644
--- a/components/history/core/browser/history_database.h
+++ b/components/history/core/browser/history_database.h
@@ -16,6 +16,7 @@
 #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"
@@ -142,6 +143,9 @@ class HistoryDatabase : public DownloadDatabase,
   // 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();