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)

29521 Roll Skia from d9d9e21b311c to a8d38078a4f3 (1 revision) (cla: yes, waiting for tree to go green)

29522 Roll Fuchsia Mac SDK from SfdmlzXiU… to nkHhPcy3q… (cla: yes, waiting for tree to go green)

29523 Roll Fuchsia Linux SDK from 5-RB9TzQH… to m90mMA37b… (cla: yes, waiting for tree to go green)

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