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This test asserts that articles within feeds report non-zero
PosInSet and SetSize, while those not contained within
a feed report PosInSet and SetSize of 0.

Change-Id: I52a2c480b08e5e3ac8434f4cb02e64bb44466cad
Reviewed-on: https://chromium-review.googlesource.com/c/1385022
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622986}