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When backing up things via cloud import, they first get snapshotted locally
before being synced to drive. If there is not enough local space for the
snapshot, backup for the affected file fails. However, sync to drive is the
bottleneck to the whole operation, so backing up a sum of files whose size
exceeds the storage available locally might have a couple of them failing. This
shouldn't affect the user, though - so wait until drive sends a sync complete
signal, then retry backing up the failed items, as long as at least one file is
backed up successfully and at least one of them fails.

Cloud import / Infini backup: Enable retry upon failure with the affected items.

Bug: 354574
Test: manual + ./out/Release/browser_tests --gtest_filter=*MediaImportHandler*
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Id29217980f7d42e7137fdb00fa7f508e1ab0c85d
Reviewed-on: https://chromium-review.googlesource.com/789171
Commit-Queue: Marianne Thieffry <mariannet@google.com>
Reviewed-by: Steve McKay <smckay@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Tomasz Mikolajewski <mtomasz@chromium.org>
Reviewed-by: Keigo Oka <oka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520885}