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Translation are normally offered automatically if the translate internals
thinks translation is necessary according to page language and the user's
settings. But in cases where the user still wants to translate, this
method can be used to manually trigger translation offers.

Change-Id: I4f71ed0142a3fec6438b883c87b514c0749a8acf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163036
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762732}