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Sample banner impressions client-side if no choiceData

Authored by Ejegg.

Description

Sample banner impressions client-side if no choiceData

Doesn't immolate RecordImpression like Krinkle wants, only cuts
down requests a hundredfold if the client knows there were no
campaigns possible this user.

Bug: T45250
Change-Id: I49f8ccb5f2bc80e823285453e993be255979c6f3

Details