https://github.com/flutter/engine/compare/38a646e14cc2...9d4b80a60cb5

git log 38a646e14cc2..9d4b80a60cb5 --no-merges --oneline
9d4b80a60 Roll src/third_party/skia 17282da3aa94..5767fc042834 (8 commits) (flutter/engine#6348)
ef98dcb11 Add support for counter timeline traces from the engine. (flutter/engine#6315)
a961e96d1 Roll buildroot to pick up updated vs toolchain. (flutter/engine#6346)
d6bb59978 Fixed IsolateNameServer documentation (flutter/engine#6344)
0c854ac01 Roll src/third_party/skia bdf1431686c2..17282da3aa94 (4 commits) (flutter/engine#6345)
e394ea1dd Roll src/third_party/skia c05302bc84da..bdf1431686c2 (1 commits) (flutter/engine#6343)
bcdfc2312 Roll src/third_party/skia 5457141b011e..c05302bc84da (1 commits) (flutter/engine#6342)
a861f37f7 Pass on the new unsafe-package-serialization option (flutter/engine#6331)
5e77a1e46 Roll src/third_party/skia bd03b54cb98d..5457141b011e (1 commits) (flutter/engine#6340)
6332db875 Roll src/third_party/skia f18c297cfb74..bd03b54cb98d (1 commits) (flutter/engine#6338)
a08bc52e8 Roll src/third_party/skia 7ffa40cedbc4..f18c297cfb74 (6 commits) (flutter/engine#6336)
8247ce26b Implement restore functions on Android and iOS (flutter/engine#6322)
2ead5c06c Roll src/third_party/skia 4ef464cd3c2e..7ffa40cedbc4 (10 commits) (flutter/engine#6334)