6693dd751 Support animated images in the CanvasKit backend (flutter/engine#15678) (#48993)

https://github.com/flutter/engine/compare/c7d0fb787922...6693dd75184b

git log c7d0fb787922..6693dd75184b --first-parent --oneline
2020-01-16 hterkelsen@users.noreply.github.com Support animated images in the CanvasKit backend (flutter/engine#15678)


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 jimgraham@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

-c7d0fb787922cb60531c415ed7bf652afbaea552
+6693dd75184b55243174d1eb0b8a575f5a584f33