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Implement the |CreateContextParams.data_quota_bytes| option, to allow
a soft-quota to be applied to persisted browsing data.

If specified the quota is treated as the "total disk space" of the /data
volume, and used to report total & free disk space amounts in SysInfo.

Since the platform does not provide native quota, nor free-bytes metrics
from filesystems, this is implemented by calling ComputeDirectorySize()
to approximate the "used disk space".

Bug: 851734, 1071393, 1148334
Bug: b/154204041
Change-Id: Iab982202490080ed9942a7a1b16c62aee5c24cfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537698
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827620}