Introduce [Exposed(Arguments)] in IDL code generator.

Source/bindings/tests/idls/core/TestInterface.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
 
     attribute long alwaysExposedAttribute;
     [Exposed=Worker] attribute long workerExposedAttribute;
     [Exposed=Window] attribute long windowExposedAttribute;
 
     [Exposed=Window, RuntimeEnabled=FeatureName] void methodWithExposedAndRuntimeEnabledFlag();
     [Exposed=Window] void overloadMethodWithExposedAndRuntimeEnabledFlag(long longArg);
     [Exposed=Window, RuntimeEnabled=FeatureName] void overloadMethodWithExposedAndRuntimeEnabledFlag(DOMString string);
     [Exposed=Window, RuntimeEnabled=FeatureName2] void overloadMethodWithExposedAndRuntimeEnabledFlag(Window window);
 
+    [Exposed(Window FeatureName, Worker FeatureName2)] void methodWithExposedHavingRuntimeEnabldFlag();
+
     [Exposed=(Window,ServiceWorker)] void windowAndServiceWorkerExposedMethod();
 
     void voidMethodPartialOverload();
     void voidMethodPartialOverload(double doubleArg);
     static void staticVoidMethodPartialOverload();
 
     Promise promiseMethodPartialOverload();
     Promise promiseMethodPartialOverload(Window window);
     static Promise staticPromiseMethodPartialOverload();
 };
 
 TestInterface implements TestImplements;
 // TestInterface implements TestImplements2; // at implement*ed* interface
 TestInterface implements TestImplements3;