29793 Revert 29789 revert 29542 freiling view ref (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29795 [Embedder] Send key data through message channel (platform-ios, cla: yes, platform-fuchsia, embedder)

29815 [fuchsia] Fixes the HID usage handling (cla: yes, waiting for tree to go green, platform-fuchsia)

29831  Remove the dart entry point args from the Settings struct (cla: yes, waiting for tree to go green, platform-fuchsia, embedder)

29844 fuchsia: Fix Flatland opacity (cla: yes, platform-fuchsia)