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Since we fetch survey content from a remote server, we have to
handle situations such as no internet or slow connections etc. To
work around all such problems, this CL creates the web dialog and
preload the survey content before showing user the bubble banner.
We only show the bubble banner after we already retrieve the survey
content. The pros of this approach include 1) avoid handling offline
and slow loading scenarios; 2) fast UI -- the dialog will immediately
show up once user consents.

BUG=979530,996542

Change-Id: I7163c1fd06a479460d4705458c880f5e17ce1b5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1745710
Commit-Queue: Wei Li <weili@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690863}