GitLab

Detects the language of the selection whenever it is set instead of
waiting for the resolve request to return.  This allows the translation
to be done during the Resolve request for the
ContextualSearchTranslations experiment.

Also update the logic for detecting the language.  Try to detect the
language of the selection first, and if that's not reliable then
run the detector on the whole context.

BUG=952401

Change-Id: I17886528f8b4c3468762fb1bcde0c27b234549d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029262
Auto-Submit: Donn Denman <donnd@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738566}