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In <settings-subpage>, if preserve-search-term boolean is set,
settings-subpage will save the subpage input term to the URL,
similar to what settings page does to the settings search input.
When user hits the back button, it will preserve the search input
from the URL.

At this moment only
chrome://settings/siteData
and
chrome://settings/content/all
have this flag turned on since they are the only places of search
results link to another subpage.

Bug: 1049887
Change-Id: I92782876f2e0ac3167fce6c4980914b4dab9b249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210731
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775844}