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Split informational text view out from main ambient image view.
Create new class AmbientInfoView.

BUG=none

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Change-Id: I55e96ae26093568cd3bbe4bfb238da2272a217b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566632
Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833420}