Roll engine 0546e1e5e901..502c9c4002a6 (2 commits) (#28446)

https://github.com/flutter/engine/compare/0546e1e5e901...502c9c4002a6

git log 0546e1e5e9015e7a597c9e59cf89ee614a260251..502c9c4002a6b456f829f79bfbd2ff61d075d1d7 --no-merges --oneline
502c9c400 Android Embedding PR 6: Introduce FlutterView structure with FlutterSurfaceView and FlutterTextureView. (flutter/engine#7896)
687229e70 Roll src/third_party/skia 52d8a5976a23..e1636a4b56aa (1 commits) (flutter/engine#7943)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

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

If the roll is causing failures, please contact the current sheriff (amirha@google.com), and stop
the roller if necessary.

bin/internal/engine.version

-0546e1e5e9015e7a597c9e59cf89ee614a260251
+502c9c4002a6b456f829f79bfbd2ff61d075d1d7