Roll engine 4c79e42..2586e94 (15 commits) (flutter#23428)

flutter/engine@4c79e42...2586e94

git log 4c79e42..2586e94 --no-merges --oneline
2586e94 Support all combinations of GetRectsForRange styles (flutter/engine#6591)
e78f86e Fix mac builds. Only Linux and Windows require default GL proc resolvers. (flutter/engine#6641)
52e48ab Fix Windows embedding. Appears that flutter#6523 or flutter#6525 introduced a bug for embedder scenarios causing the window native library to be incorrectly initialized and thus incapable of correctly resolving GL functions.  This change fixes that. (flutter/engine#6624)
c9197e4 Roll src/third_party/skia 25837bf17019..b46c4d0925ad (6 commits) (flutter/engine#6640)
324c21a Roll src/third_party/skia 1b07dffd979d..25837bf17019 (1 commits) (flutter/engine#6639)
5dfbc0a Roll src/third_party/skia e023ae7c5540..1b07dffd979d (1 commits) (flutter/engine#6638)
4a18dff Roll src/third_party/skia ff1aeb953faf..e023ae7c5540 (1 commits) (flutter/engine#6637)
427915e Allow FlutterViewController to specify whether its FlutterView is opaque (flutter/engine#6570)
20c805c Ensure that Scene::toImage renders texture backed images. (flutter/engine#6636)
25d0507 Roll buildtools to 5a9e1b3a0b84a2871f20f85fde665e54a894ba72 (flutter/engine#6633)
4f17d7e Roll src/third_party/skia 327955b1ba19..ff1aeb953faf (13 commits) (flutter/engine#6635)
cdd592f Reland &flutter#39;Pass null instead of &flutter#39;none&flutter#39; locale&flutter#39; (flutter/engine#6632)
2cd8920 Roll src/third_party/skia b1a002e850e1..327955b1ba19 (12 commits) (flutter/engine#6631)
edfe024 13771 - iOS dictation bug (flutter/engine#6607)
cadf440 Roll src/third_party/skia b9998cdceec7..b1a002e850e1 (13 commits) (flutter/engine#6626)

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bin/internal/engine.version

@@ -1 +1 @@
-cdd592f5be97e8245b31d7621bc95234b62c3a43
+2586e941225726f0429b9e67f4d9b6ab404d7b1e