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As a workaround, SetCompositionRange can be implemented by first
finishing the current composition, deleting the new composition range,
and recomposing with the deleted text.

Works ok on a nocturne, but flickers about 10% of the time due to
latency from deleting and recomposing.

Bug: 1113940
Change-Id: If7147d3727850694cc68c45662f72178bcb06fd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340943
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Leo Zhang <googleo@chromium.org>
Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795722}