29248 Deprecate android v1 embedding (platform-android, cla: yes, needs tests)

29266 Update to match harfbuzz subsetting 3.0.0 api. (cla: yes, needs tests)

29270 Call rapidjson::ParseResult::IsError to check for JSON parsing errors (cla: yes, waiting for tree to go green, needs tests)

29280 Fix typos (platform-ios, platform-android, cla: yes, waiting for tree to go green, platform-web, platform-macos, platform-linux, platform-fuchsia, needs tests)

29287 VSyncWaiter on Fuchsia will defer firing until frame start time (cla: yes, waiting for tree to go green, platform-fuchsia, needs tests)

29298 add flow events to the timeline to track the lifecycle of cache images (cla: yes, waiting for tree to go green, needs tests)