Also Fix MockCanvas clipping so tests will work with new culling

* Fix use of uninitialized memory in animator

Discovered via MSAN build of embedder_unittests

Sends the flutter/settings update message to the engine after starting
it. For now values other than 24-hour time preference are hard-coded,
but dark mode support can be added later.

Fixes https://github.com/flutter/flutter/issues/65590

* enable safari tests for almost all the methods for semantics tests

* enable almost all semantics tests for firefox

* Safari desktop have different scroll max values for different versions

* fix assert

https://skia.googlesource.com/skia.git/+log/b27f39c92410..95b5fb9213d7

2020-11-23 reed@google.com Revert "Share code handling legacy SkFilterQuality"
2020-11-23 michaelludwig@google.com Reland "Simplify layer bounds syncing and no-device error handling in SkCanvas::internalSaveLayer"

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC adlai@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/+doc/master/autoroll/README.md

binding IOSurfaces to textures / framebuffers.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-linux-sdk-flutter-engine
Please CC jsimmons@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/+doc/master/autoroll/README.md

Fixes https://github.com/flutter/flutter/issues/70938

Co-authored-by: NSanjay Chouksey <sanjayc@google.com>