pine: Save and display a temporary title for non browser apps

App titles are fetched via appIDs from the app service. Sometimes, the
app service is not ready when pine is created. This CL makes it so we
save the last session's title into full restore file, and uses that
temporarily.

In future CLs, we will monitor when the app service is ready and
replace the temporary title with the one fetched from app service. In
most cases, it should be the same anyhow.

Bug: b:328830102
Test: manual
Change-Id: I7ce9ad14c7f079f7668f72a4e681ee5e35f36a60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5375413
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1274544}