Is there an existing issue for this?

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Use case

flutter/engine#41982 fixes BasicMessageChannel.resizeChannelBuffer which was broken.
The fix was based on the existing implementation which relies on a deprecated format (see flutter/engine#41982 (comment)).

Proposal

Replace BasicMessageChannel.resizeChannelBuffer implementation to rely on the expected and more efficient format.

While doing so, consider providing a similar helper for the overflow control message, see https://github.com/flutter/engine/blob/5b47c05770609a6f10d84e624c43c94bc7b4de4d/lib/ui/channel_buffers.dart#L447-L458