Add use counters for the experimental Budget API methods

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

 // Copyright 2016 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.
 
 // https://wicg.github.io/budget-api/#budget-service-interface
 
 enum OperationType {
     "silent-push"
 };
 
 [
     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);
 };