Re: [webcomponents] Difference between composed document and document flat tree (#382)

In general, I am fan of the current naming.

The mental model behind the scene is:

- We are given multiple `component tree`s. Each represents a unit of a `component`.
- Then, they are composed into a one giant tree (of trees). We call it `composed tree (of component trees)`.  
- Then, we are flattening `composed tree` into a `flat tree`, which is delivered to a user.


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https://github.com/w3c/webcomponents/issues/382#issuecomment-185740373