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We should call |ITfThreadMgr::SetFocus| to notify input service about
focus change even if the input type has not changed.

This issue is introduced by crrev.com/810350.

Bug: 1133474
Bug: 1124612

Change-Id: I219fb624fb649b870bc081fbdac56373c1102d66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438478Reviewed-by: Siye Liu <siliu@microsoft.com>
Reviewed-by: Yohei Yukawa <yukawa@chromium.org>
Commit-Queue: Siye Liu <siliu@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#812203}