Re: [webcomponents] Use FrozenArray<T> in WebIDL (#361)

Thanks. I'm fine to make `deepPath` method, e.g. `Event.deepPath()`, however,
I'm afraid that I do not understand why user agents has to allocate an array for each event if it is an attribute. User agents can create an array lazily only when event.deepPath attribute is actually accessed?

FYI. I remember we had the similar discussions in the past event.path vs event.path():
- https://code.google.com/p/chromium/issues/detail?id=234030#c22
- https://www.w3.org/Bugs/Public/show_bug.cgi?id=25458

@dglazkov , WDYT?

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