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This CL implements below functions:
1. Save the app launch information to local variable
|file_path_to_restore_data_|.

2. Add flags |ShouldUpdate| per profile path to record whether there
are updates to be saved to the full restore file.

3. Add a timer to delay and cache the restore data writing.

4. Call FullRestoreFileHandler to write the restore data from
|file_path_to_restore_data_| to the full restore file on a background
task.

There will be a separate CL to add tests.

Bug: 1146900
Change-Id: Icf7a674d0d474005eb8dc33b39b5660ab6436153
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589613
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837880}