28334 Fix typo in a comment in #28098 (cla: yes, waiting for tree to go green, platform-windows, needs tests)

28407 fuchsia: Fix MissingPluginException being thrown in Dart from platform_view.cc (platform-ios, platform-android, cla: yes, platform-web, platform-macos, platform-linux, platform-windows, platform-fuchsia, needs tests, embedder)

28648 Keyboard guarantee non empty events (cla: yes, platform-web, platform-macos, platform-linux, platform-windows)

28724 [UWP] Add modifier keys support (cla: yes, platform-windows, needs tests)

28970 [Windows] Add restart hooks, and reset keyboard (cla: yes, platform-windows, needs tests)

29100 Fix build flags for WinUWP (cla: yes, waiting for tree to go green, platform-windows)