29529 [raster_cache] Increment access_count on Touch (cla: yes, needs tests)

29530 use SkMatrix.invert() instead of MatrixDecomposition to validate cache matrices (cla: yes, waiting for tree to go green, needs tests)

29531 [ios_platform_view, a11y] Make FlutterPlatformViewSemanticsContainer a SemanticsObject. (platform-ios, cla: yes, waiting for tree to go green, needs tests)

29533 Remove D3D9 fallback path (cla: yes, platform-windows, needs tests)

29542 [fuchsia][flatland] route ViewRefs properly for Focus (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29596 Add default implementations to new methods added to BinaryMessenger (platform-android, cla: yes, waiting for tree to go green, needs tests)