Amir Hardon 3e93cdffaa Plumb the iOS PlatformViewsController into flow. (flutter/engine#6603)
For flow to manipulate the embedded UIViews during the paint traversal
it needs some hook in PaintContext.
This PR introduces a ViewEmbeder interface that is implemented by the
iOS PlatformViewsController and plumbs it into PaintContext.

The ViewEmbedder interface is mainly a place holder at this point, as
this PR is focused on just the plumbing.
2018-10-26 14:26:59 -07:00
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