[automerger skipped] Merge "Add comments in grouping APIs to clarify possible exceptions." am: 42adca41b9
am:7aacd1081d-s ours am skip reason: change_id I3671e366be7e8c3a75b5ee23b7cf88a33ecd3a4f with SHA1e00887f612is in history Change-Id: Ib4f1629b1072cc4af736a1c15a8d5faac72f0ce8
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