Worker: Raise an exception when an invalid feature number is passed to WorkerInternals::CountFeature

third_party/WebKit/Source/core/testing/WorkerInternals.idl

Index: third_party/WebKit/Source/core/testing/WorkerInternals.idl
diff --git a/third_party/WebKit/Source/core/testing/WorkerInternals.idl b/third_party/WebKit/Source/core/testing/WorkerInternals.idl
index a49c02ef3cd1ba5c68a30c39be2800f6de62cf95..4f372e977aca4bf9b34520153db03e59998069fc 100644
--- a/third_party/WebKit/Source/core/testing/WorkerInternals.idl
+++ b/third_party/WebKit/Source/core/testing/WorkerInternals.idl
@@ -7,8 +7,8 @@ interface WorkerInternals {
 
     // Records |feature| in worker's use counter. |feature| must be one of the
     // values from the UseCounter::Feature enum.
-    [CallWith=ScriptState] void countFeature(unsigned long feature);
-    [CallWith=ScriptState] void countDeprecation(unsigned long feature);
+    [CallWith=ScriptState, RaisesException] void countFeature(unsigned long feature);
+    [CallWith=ScriptState, RaisesException] void countDeprecation(unsigned long feature);
 
     [CallWith=ScriptState] void collectGarbage();
 };