16270 Started coalescing updates to viewport metrics after foregrounding the app. (cla: yes)

16272 Roll src/third_party/skia 36c0521d57de..6305b2f8342a (8 commits) (autoroller: commit, cla: yes)

16276 Fix delete of entire selection in macOS text input (cla: yes)

16277 Revert “Migrate flutter_runner from flutter_runner::{Thread,Loop} to fml::{Thread,MessageLoop} (#15118)” (cla: yes)

16280 Remove superfluous INFO logs from //flutter/runtime. (cla: yes)

16283 Fix runtime_unittest in AOT mode by loading AOT symbols from ELF loader. (cla: yes)