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

25998 Sped up the objc standard message codec (platform-ios, cla: yes, platform-macos)

26117 Revert “Sped up the objc standard message codec (#25998)” (platform-ios, cla: yes, waiting for tree to go green, platform-macos)

26302 Add support for compositing using Metal on macOS (cla: yes, platform-macos)

26347 MacOS: Do not send key event if modifiers flags haven’t changed (cla: yes, platform-macos)