Expose the BudgetService interface to Workers.

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 045dce823810f9b7a66291733a7906f7d4b62f6f..a716869824b2d7b96d48a6592e849708e470e185 100644
--- a/third_party/WebKit/Source/modules/budget/BudgetService.idl
+++ b/third_party/WebKit/Source/modules/budget/BudgetService.idl
@@ -9,7 +9,8 @@ enum OperationType {
 };
 
 [
-    RuntimeEnabled=Budget
+    RuntimeEnabled=Budget,
+    Exposed=(Window,Worker)
 ] interface BudgetService {
     [CallWith=ScriptState] Promise<double> getCost(OperationType operation);
     [CallWith=ScriptState] Promise<sequence<BudgetState>> getBudget();