Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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Test interface for https://bugzilla.mozilla.org/show_bug.cgi?id=809674 .
This test makes sure that accessing JS-implemented attributes or methods marked with [implicit_jscontext] works as expected.
It also makes sure [optional_argc] is not supported on JS-implemented methods.