Plumb reserve method of the BudgetAPI

third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html

Index: third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html b/third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html
index 66290d7c268dce6855cbe5f0c040dc40874562ee..55d47e7af30b2ee7c4b03ac8f83af1127a4fb396 100644
--- a/third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html
+++ b/third_party/WebKit/LayoutTests/http/tests/budget/get-cost.html
@@ -15,6 +15,7 @@
       promise_test(function() {
         return budgetServiceMock.then(mock => {
           assert_own_property(Navigator.prototype, 'budget');
+          mock.setCost("silent-push", TEST_BUDGET_COST);
           return navigator.budget.getCost("silent-push");
         }).then(cost => {
           assert_equals(cost, TEST_BUDGET_COST);
@@ -29,7 +30,7 @@
           assert_unreached('getCost should have failed with an invalid argument.');
         }, function(error) {
           assert_equals(error.name, 'TypeError');
-          assert_equals(error.message, "Failed to execute 'getCost' on 'BudgetService': The provided value 'frobinator' is not a valid enum value of type ActionType.");
+          assert_equals(error.message, "Failed to execute 'getCost' on 'BudgetService': The provided value 'frobinator' is not a valid enum value of type OperationType.");
         });
       }, 'BudgetService.GetCost should return Type Error if an invalid argument is provided.');
     </script>