[w3c/webcomponents] Events whose composed flag should be true (#513)

We have decided to use `Event.composed` flag (false by default), instead of `Event.scoped`, negating its meaning. See the context: https://github.com/whatwg/html/issues/1160.

That means we should have a list of exceptional events whose composed flag should be true,
instead of the [current list](http://w3c.github.io/webcomponents/spec/shadow/#scoped-flag).

Eventually, instead of having a list in one place, each event's definition should mention its composed flag should be true in each place, but I would like to have a rough consensus here.

I have made a list of events, referring UIEvent spec: https://w3c.github.io/uievents/#event-types-list, whose composed flag should be true by default, I think:

-  Focus Events: blur, focus, focusin, focusout
-  Mouse Events: click, dblclick, mousedown, mouseenter, mousemove, mosueout, mouseover, mouseup
-  Wheel Events: wheel
-  Input Events: beforeinput, input
-  Keyboard Events: keydown, keyup
-  Composition Events: compositionstart, compositionupdate, compositionend

I am going to update Blink's implementation, however, but what do you think about Composition Events? Should we exclude Composition Events from here?


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