29508 Embedder VsyncWaiter must schedule a frame for the right time (#29408) (cla: yes, embedder)

29520 Enable Skia’s Vulkan backend on all non-mobile platforms, and test SwiftShader Vulkan on all GL unittests platforms (platform-ios, platform-android, cla: yes, embedder)

29524 Fix FlutterPresentInfo struct_size doc string (cla: yes, waiting for tree to go green, embedder)

29621 Fix UB in semantics updates (cla: yes, needs tests, embedder)

29638 [Embedder] Send key data through message channel (platform-ios, cla: yes, platform-web, platform-fuchsia, embedder)

29727 Use eglPresentationTimeANDROID to avoid bogging down the GPU (platform-ios, platform-android, cla: yes, embedder)