[google_maps_flutter] Set properties before adding maps objects (#10347) It appears that the Google Maps SDK on iOS renders on a different thread, and doesn't necessarily batch all updates that happen in a runloop the way standard iOS UI would, so that adding an object to the map before setting all of its properties can cause a flicker of the default property. This ensures that updating the native maps object from the Dart version sets all properties before adding the object to the map, and refactors to make unit testing the update helper simpler (and in one case, to fix an init-calls-self violation). Fixes https://github.com/flutter/flutter/issues/143570 ## Pre-Review Checklist [^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.
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