51a376d73 [Windows] Update API for alternative Windows shell platform implementation (flutter/engine#11327) (#39710)


git@github.com:flutter/engine.git/compare/3deb8f5e45e1...51a376d73ba1

git log 3deb8f5e45e1..51a376d73ba1 --no-merges --oneline
2019-09-03 james@clarkezone.net [Windows] Update API for alternative Windows shell platform implementation (flutter/engine#11327)


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 garyq@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