Enable the WebIDL [Exposed] annotation on an interface's members.

Source/bindings/tests/idls/TestInterface.idl

Index: Source/bindings/tests/idls/TestInterface.idl
diff --git a/Source/bindings/tests/idls/TestInterface.idl b/Source/bindings/tests/idls/TestInterface.idl
index 6c7628fca8f58f3364780ac5c4514605096d8371..7dfed9a9bb6e7461c5dcd94526a15c383c402969 100644
--- a/Source/bindings/tests/idls/TestInterface.idl
+++ b/Source/bindings/tests/idls/TestInterface.idl
@@ -40,6 +40,7 @@
     RuntimeEnabled=FeatureName,
     SetWrapperReferenceTo(TestInterface referencedName),
     TypeChecking=Interface|Unrestricted,
+    Exposed=(Worker,Window),
 ] interface TestInterface : TestInterfaceEmpty {
     // members needed to test [ImplementedAs], as this affect attribute
     // configuration and method configuration, and [TypeChecking]
@@ -71,6 +72,21 @@
     deleter boolean (DOMString name);
 
     [NotEnumerable] stringifier;
+
+    // Per-method [Exposed] annotation support.
+    void alwaysExposedMethod();
+    [Exposed=Worker] void workerExposedMethod();
+    [Exposed=Window] void windowExposedMethod();
+
+    static void alwaysExposedStaticMethod();
+    [Exposed=Worker] static void workerExposedStaticMethod();
+    [Exposed=Window] static void windowExposedStaticMethod();
+
+    attribute long alwaysExposedAttribute;
+    [Exposed=Worker] attribute long workerExposedAttribute;
+    [Exposed=Window] attribute long windowExposedAttribute;
+
+    [Exposed=(Window,ServiceWorker)] void windowAndServiceWorkerExposedMethod();
 };
 
 TestInterface implements TestImplements;