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This is an unchanged reland of 3481a5a7 .
The test failure that caused this CL to be reverted
(https://ci.chromium.org/p/chromium/builders/ci/android-pie-x86-rel/2212)
looks like unrelated pre-existing flake; for example, this run
from September 7 has the same failure:
https://ci.chromium.org/p/chromium/builders/ci/android-pie-x86-rel/2123 .

I will separately handle marking that test flaky.

TBR=jam@chromium.org

Original change's description:
> [WebLayer] Add ability to override translate target language
>
> This CL adds the ability to override the target language used by the
> translate feature on a per-Tab basis. This is analogous to the
> functionality of CCT's TRANSLATE_LANGUAGE intent extra. Once the
> override is set, all translate infobars in the given Tab will appear
> with the specified language as the target language. Calling
> Tab#setTranslateTargetLanguage() with an empty string clears the
> override and causes behavior to revert to normal.
>
> Note that even with the override set the translate infobar will not
> appear for pages that are in the user's locale. This is internal
> behavior of Chromium's translate component and is common to CCT and
> WebLayer.
>
> I marked the added method as since 86 as this CL will be targeted for
> cherrypicking to 86.
>
> Bug: 1116394
> Change-Id: Ic4f08c16a64a3f0ceebed5feab7cdc9401001279
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397716
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Clark DuVall <cduvall@chromium.org>
> Commit-Queue: Colin Blundell <blundell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#806633}

Bug: 1116394
Change-Id: If8d8058584a260171c83687c2dfcf6732a33846c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410478Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806966}