Entering immersive corrupts part of the screen for a frame due to GL context size mismatch

<a href="https://github.com/apwilson"><img src="https://avatars.githubusercontent.com/u/142874?v=3" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [apwilson](https://github.com/apwilson)**
_Thursday Sep 17, 2015 at 23:55 GMT_
_Originally opened as https://github.com/flutter/engine/issues/1227_

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It's hard to explain better than that but I've a video I can share offline.
