18649 check the branch flags (cla: yes)

18650 [web] runs ios unit tests (cla: yes)

18652 Roll buildroot to 6669621484b649b9355fb2dd37950daf3d2ac65b (cla: yes, waiting for tree to go green)

18653 [fuchsia] Avoid unnecessary layout transition. (cla: yes)

18654 Revert “check the branch flags” (cla: yes)

18656 fuchsia: Disable flaky TimeSensistiveTests (cla: yes)

18657 Disconnect the channel message handler when releasing the AccessibilityBridge (cla: yes, waiting for tree to go green)