[w3c/webcomponents] Web Components F2F topics for 2018 TPAC (#763)

Now we have [3-hour slot at TPAC](https://github.com/w3c/WebPlatformWG/issues/120).

We should gather topics which needs F2F discussion. I propose the following topics:
 - [<iframe> and the History API](#184)
 - [How should various document internal references work when SVG is being used in shadow DOM](#179)
 - [How to define APIs only for custom element authors](#758)

Please add more topics to this issue so that each browser vendor can have their internal discussion upfront (this seems to have helped a lot in the past).

@domenic @tkent-google @annevk @bzbarsky @smaug---- @travisleithead 

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