Unfortunately it does.

The way prerender works with AMP is that a Tab will be created with a dummy WebContents, then a prerender will start, and in Tab#loadUrl(), swap will be called.

In this case there is nothing to swap (or we swap "empty" objects), but we still call it.

Oh, right. Thanks for reminder!

I vaguely remember dummyWebContents, it was probably back in times when we did not have detached tabs .. It is probably then easiest to unlink all other SwapInternal clients and wait for the switch to BG tab implementation. 

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still likely to be fixed :)