[bindings] Support is_explicit_nullable for method arguments.

Source/bindings/tests/idls/core/TestObject.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 329 matching lines @@
     void voidMethodFloat32ArrayArg(Float32Array float32ArrayArg);
     void voidMethodInt32ArrayArg(Int32Array int32ArrayArg);
     void voidMethodUint8ArrayArg(Uint8Array uint8ArrayArg);
     // Arrays
     long[] longArrayMethod();
     DOMString[] stringArrayMethod();
     TestInterfaceEmpty[] testInterfaceEmptyArrayMethod();
     void voidMethodArrayLongArg(long[] arrayLongArg);
     void voidMethodArrayStringArg(DOMString[] arrayStringArg);
     void voidMethodArrayTestInterfaceEmptyArg(TestInterfaceEmpty[] arrayTestInterfaceEmptyArg);
+    void voidMethodNullableArrayLongArg(long[]? arrayLongArg);
     // Sequences
     sequence<long> longSequenceMethod();
     sequence<DOMString> stringSequenceMethod();
     sequence<TestInterfaceEmpty> testInterfaceEmptySequenceMethod();
     void voidMethodSequenceLongArg(sequence<long> longSequenceArg);
     void voidMethodSequenceStringArg(sequence<DOMString> stringSequenceArg);
     void voidMethodSequenceTestInterfaceEmptyArg(sequence<TestInterfaceEmpty> testInterfaceEmptySequenceArg);
     void voidMethodSequenceSequenceDOMStringArg(sequence<sequence<DOMString>> stringSequenceSequenceArg);
+    void voidMethodNullableSequenceLongArg(sequence<long>? longSequenceArg);
     // Nullable types
     long? nullableLongMethod();
     DOMString? nullableStringMethod();
     TestInterface? nullableTestInterfaceMethod();
     sequence<long>? nullableLongSequenceMethod();
     // Union types
     (TestInterfaceGarbageCollected or DOMString) testInterfaceGarbageCollectedOrDOMStringMethod();
     (TestInterfaceWillBeGarbageCollected or TestDictionary) testInterfaceWillBeGarbageCollectedOrTestDictionaryMethod();
     (boolean or DOMString or unrestricted double) booleanOrDOMStringOrUnrestrictedDoubleMethod();
     (TestInterface or long) testInterfaceOrLongMethod();
@@ skipping 213 matching lines @@
     [ImplementedInPrivateScript] attribute DOMString stringAttribute;
     [ImplementedInPrivateScript] attribute Node nodeAttribute;
     [OnlyExposedToPrivateScript] short methodImplementedInCPPForPrivateScriptOnly(short value1, short value2);
     [OnlyExposedToPrivateScript] attribute DOMString attributeImplementedInCPPForPrivateScriptOnly;
     [ImplementedInPrivateScript, OnlyExposedToPrivateScript] short methodForPrivateScriptOnly(short value1, short value2);
     [ImplementedInPrivateScript, OnlyExposedToPrivateScript] attribute DOMString attributeForPrivateScriptOnly;
     [ImplementedInPrivateScript] attribute TestEnum enumForPrivateScript;
 
     maplike<long, DOMStringOrDouble>;
 };