GitLab

If a page is being prerendered, we don't need to capture its text for
the translate agent. This adds a check and skips page text capture.

Bug: 1096088
Change-Id: I566495f377bd26d7cdc4f45c3b40c52fd76379eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352820
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798105}