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Android API [1] allows it, so we should too.

[1] https://developer.android.com/reference/android/view/inputmethod/InputConnection#setComposingRegion(int,%20int)

Bug: b/170796179
Change-Id: Iabb31d34e56f46a3b05dd53324b19169af0a53fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2483943Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819241}