25867 Switch PlatformMessages to hold data in Mappings (platform-ios, platform-android, cla: yes, platform-macos, platform-fuchsia, embedder)

25900 Fix composition when multiple platform views and layers are combined  (platform-android, cla: yes, waiting for tree to go green)

25940 Remove unused parameter in flutter application info loader (platform-android, cla: yes, waiting for tree to go green)

25943 Update documentation for embedding SplashScreen (platform-android, cla: yes, waiting for tree to go green)

25952 Added exception if you try to reply with a non-direct ByteBuffer. (platform-android, cla: yes)

25988 Platform channels, eliminate objc copies (platform-ios, platform-android, cla: yes, waiting for tree to go green, platform-macos, platform-fuchsia, embedder)