29397 [fuchsia] Add more logging for error cases. (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29402 WeakPtrFactory should be destroyed before any other members. (platform-ios, cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29451 Roll Skia from ccb459d57b26 to 784b7b7ab541 (1 revision) (cla: yes, waiting for tree to go green)

29453 Manually roll fuchsia SDK to Qv7WqmG8hOpj9NV5Ng6rBDSQW7KeowbX0kpbW0FaZgIC (cla: yes, waiting for tree to go green)