29367 Re-enable A11yTreeIsConsistent with higher timeout (cla: yes, waiting for tree to go green, embedder)

29371 Prepare scripts for the master to main migration. (cla: yes, platform-web, needs tests)

29377 Fix race condition introduced by background platform channels (platform-android, cla: yes, needs tests)

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)

29419 [web] feature-detect and use ImageDecoder for all image decoding (cla: yes, platform-web)