23154 Fix macOS crash when modifier keys pressed. (cla: yes)

23155 Roll fuchsia toolchain (cla: yes)

23158 Update FlutterPlatformViewsTests (cla: yes, platform-ios, waiting for tree to go green)

23160 [web] Placeholders for rich paragraphs (cla: yes, platform-web)

23161 Revert “[web] Switch web-render option default to auto” (cla: yes)

23162 [web] Enable the new rich paragraph implementation (cla: yes, platform-web)

23164 Roll Skia from 7b920446a8fc to dfc880bd9ba0 (14 revisions) (cla: yes, waiting for tree to go green)