Roll engine 2707b7433874..e79d77f6e6cd (7 commits) (#23305)

(consider the rope to be green as the red commit is reverted and everything is green before that commit.)

https://github.com/flutter/engine/compare/2707b7433874...e79d77f6e6cd

git log 2707b7433874..e79d77f6e6cd --no-merges --oneline
e79d77f6e Add offset to engine OpacityLayer (flutter/engine#6594)
a9974a3f4 Roll src/third_party/skia 1bccae517ace..eb772c0869d5 (6 commits) (flutter/engine#6612)
2fab7d729 Roll src/third_party/skia e2865b28005f..1bccae517ace (1 commits) (flutter/engine#6611)
8b069adf1 Revert "Roll buildroot to 4ee38927dc45c46f2a1c74b1e3700b3cf953e747 (#6586)" (flutter/engine#6610)
958086d5a Roll src/third_party/skia 607d2610e5e3..e2865b28005f (2 commits) (flutter/engine#6608)
d0fae0428 Roll src/third_party/skia 9a986cfd5f58..607d2610e5e3 (4 commits) (flutter/engine#6606)
c0b1b37d6 Roll src/third_party/skia 798a713685a9..9a986cfd5f58 (2 commits) (flutter/engine#6604)

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bin/internal/engine.version

-2707b7433874a8b03e4a1f7341d45b5cdcc8dfc6
+e79d77f6e6cdcfedf6a01b2a44b00de0260b7ede