Add use counters for the experimental Budget API methods

third_party/WebKit/Source/modules/budget/BudgetService.idl

Index: third_party/WebKit/Source/modules/budget/BudgetService.idl
diff --git a/third_party/WebKit/Source/modules/budget/BudgetService.idl b/third_party/WebKit/Source/modules/budget/BudgetService.idl
index 3f893197aba13d57649e8eb8305e59305b93d64c..e0235e2bd30f4f2bfd76414dae2f7d33fe7d4272 100644
--- a/third_party/WebKit/Source/modules/budget/BudgetService.idl
+++ b/third_party/WebKit/Source/modules/budget/BudgetService.idl
@@ -12,7 +12,7 @@ enum OperationType {
     RuntimeEnabled=Budget,
     Exposed=(Window,Worker)
 ] interface BudgetService {
-    [OriginTrialEnabled=BudgetQuery, CallWith=ScriptState] Promise<double> getCost(OperationType operation);
-    [OriginTrialEnabled=BudgetQuery, CallWith=ScriptState] Promise<sequence<BudgetState>> getBudget();
+    [OriginTrialEnabled=BudgetQuery, CallWith=ScriptState, MeasureAs=BudgetAPIGetCost] Promise<double> getCost(OperationType operation);
+    [OriginTrialEnabled=BudgetQuery, CallWith=ScriptState, MeasureAs=BudgetAPIGetBudget] Promise<sequence<BudgetState>> getBudget();
     [CallWith=ScriptState] Promise<boolean> reserve(OperationType operation);
 };