27fa60793 Added docstring for FlutterOverlayView. (flutter/engine#14019) (#45642)

git@github.com:flutter/engine.git/compare/e136d637a873...27fa60793bcb

git log e136d637a873..27fa60793bcb --first-parent --oneline
2019-11-26 30870216+gaaclarke@users.noreply.github.com Added docstring for FlutterOverlayView. (#14019)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC cbracken@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

bin/internal/engine.version

-e136d637a87379658ee8f326c4e7875315d1f926
+27fa60793bcb870ebd3a5f6e940005ddb50eae4f