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PersistedTabData stores tab metadata across restarts and
FilePersistedTabDataStorage is the method of persisting the data
in a file.

Various use cases such as serialization, save, restore and delete
now have metrics associated with them.

Bug: 1059635
Change-Id: I3f7d267227819eefb30b23b95a85a637e22fef7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2125229
Commit-Queue: David Maunder <davidjm@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784335}