Add in expiring budget

chrome/browser/budget_service/budget_database.h

Index: chrome/browser/budget_service/budget_database.h
diff --git a/chrome/browser/budget_service/budget_database.h b/chrome/browser/budget_service/budget_database.h
index 0e70b34e2724be02ef610e3110ee26b562702609..26a8f44a04d067a02eb6205b7337299e1f29c68a 100644
--- a/chrome/browser/budget_service/budget_database.h
+++ b/chrome/browser/budget_service/budget_database.h
@@ -18,6 +18,7 @@
 namespace base {
 class Clock;
 class SequencedTaskRunner;
+class Time;
 }
 
 namespace budget_service {
@@ -31,7 +32,7 @@ class GURL;
 class BudgetDatabase {
  public:
   // Data structure for returing the budget decay expectations to the caller.
-  using BudgetExpectation = std::list<std::pair<double, double>>;
+  using BudgetExpectation = std::list<std::pair<double, base::Time>>;
 
   // Callback for setting a budget value.
   using StoreBudgetCallback = base::Callback<void(bool success)>;
@@ -86,6 +87,8 @@ class BudgetDatabase {
   void WriteCachedValuesToDatabase(const GURL& origin,
                                    const StoreBudgetCallback& callback);
 
+  void CleanupExpiredBudget(const GURL& origin);
+
   // The database for storing budget information.
   std::unique_ptr<leveldb_proto::ProtoDatabase<budget_service::Budget>> db_;