9556 Minimal integration with the Skia text shaper module

9561 libtxt: fix reference counting of SkFontStyleSets held by font asset providers

9585 Fix a race in the embedder accessibility unit test

9589 Fixes a plugin overwrite bug in the plugin shim system.

9590 Apply patches that have landed in topaz since we ported the runners to the engine repo

9591 Document various classes in //flutter/shell/common.

9632 Added Doxyfile.

9633 Cherry-pick fix for flutter/flutter#35291

9640 make EmbeddedViewParams a unique ptr

9642 Fix warning about settings unavailable GN arg build_glfw_shell

9651 Move the mutators stack handling to preroll