Roll engine 75387dbc147d..49445ce4949b (32 commits) (#35952)

https://github.com/flutter/engine/compare/75387dbc147d...49445ce4949b

git log 75387dbc147d1cee8164f5d61582eab8ba1e5058..49445ce4949bf0d28506a6b22e28b4264f624e5f --no-merges --oneline
49445ce49 FLEViewController/Engine API changes (flutter/engine#9750)
2a79462fd Add Fuchsia build CI presubmit steps (flutter/engine#9736)
67cebdb92 Roll fuchsia/sdk/core/linux-amd64 from KGmm_RIJoXS19zTm2crjM3RYpmp5Y03-fLUeVdylbTYC to ehWVT9QJbC-vFMM6SkkQM9HJ9oITFCws7FC9JnrFq2gC (flutter/engine#9765)
089c74084 Roll fuchsia/sdk/core/mac-amd64 from lCQWEeR_Ert7t_qAbMRycwrRyZC-dIprYPyPJzwPmg4C to EYnRdXFT9l-d8Qkz4zeTRXnqfV3KQzpQhoPs1r0-740C (flutter/engine#9759)
b22410ef6 Include SkParagraph headers only when the enable-skshaper flag is on (flutter/engine#9758)
2cd650d26 Minimal integration with the Skia text shaper module (flutter/engine#9556)
f775f5e4d Re-enable the Wuffs GIF decoder (flutter/engine#9466)
aca048236 Make all shell unit tests use the OpenGL rasterizer. (flutter/engine#9746)
bc57291ff Make FLEViewController's view an internal detail (flutter/engine#9741)
9776043ea Synchronize main thread and gpu thread for first render frame (flutter/engine#9506)
f600ae830 Use libc++ variant of string view and remove the FML variant. (flutter/engine#9737)
564f53f0a Revert "Improve caching limits for Skia (#9503)" (flutter/engine#9740)
b453d3c3d libtxt: fix reference counting of SkFontStyleSets held by font asset providers (flutter/engine#9561)
fa7627d17 Fix backspace crash on Chinese devices (flutter/engine#9734)
56885f79b Let pushColorFilter accept all types of ColorFilters (flutter/engine#9641)
6dccb21e6 Roll src/third_party/skia 96fdfe0fe88e..af4e7b6cf616 (1 commits) (flutter/engine#9735)
8511d9b47 Roll fuchsia/sdk/core/mac-amd64 from byM-kyxL4bemlTYNqhKUfJfZoIUrCSzS6XzsFr4n9-MC to lCQWEeR_Ert7t_qAbMRycwrRyZC-dIprYPyPJzwPmg4C (flutter/engine#9742)
b3bf0a182 Roll fuchsia/sdk/core/linux-amd64 from I2Qe1zxgckzIzMBTztvzeWYsDgcb9Fw-idSI16oIlx8C to KGmm_RIJoXS19zTm2crjM3RYpmp5Y03-fLUeVdylbTYC (flutter/engine#9743)
7e568232a Fix windows test by not attempting to open a directory as a file. (flutter/engine#9745)
6cf0d1350 Roll src/third_party/skia a3ffaabcc4f2..96fdfe0fe88e (5 commits) (flutter/engine#9731)
49a00aed8 Fix Fuchsia build. (flutter/engine#9730)
b3bb39b0b Roll src/third_party/dart 06c3d7ad3a...09fc76bc51 (flutter/engine#9728)
2284210f4 Make the license script compatible with recently changed Dart I/O stream APIs (flutter/engine#9725)
ad582b508 Rework image & texture management to use concurrent message queues. (flutter/engine#9486)
1dcd5f52b Roll src/third_party/skia 6b82cf638682..a3ffaabcc4f2 (24 commits) (flutter/engine#9726)
129979cab Revert "Roll src/third_party/dart 06c3d7ad3a..7acecda2cc (12 commits)" (flutter/engine#9724)
8020d7e43 Roll src/third_party/skia 56065d9b875f..6b82cf638682 (3 commits) (flutter/engine#9718)
e24bd7846 Roll src/third_party/dart 06c3d7ad3a..7acecda2cc (12 commits)
3d2668c35 Reland isolate group changes
802bd1518 iOS platform view opacity (flutter/engine#9667)
3b6265b74 Roll src/third_party/dart b5aeaa6796..06c3d7ad3a (44 commits)
887e05233 Refactor ColorFilter to have a native wrapper (flutter/engine#9668)

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bin/internal/engine.version

-75387dbc147d1cee8164f5d61582eab8ba1e5058
+49445ce4949bf0d28506a6b22e28b4264f624e5f