Exporting three counters:
1) File comments that are ported as patchset level comments.
2) Line/range comments that are ported as file level comments.
3) Line/range comments that are ported as line/range comments.
This change does not differentiate between published vs. draft comments.
Change-Id: Idc031a3e1701eda749f9e0f2477c2377f1d38249