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This CL adds an additional test for the non-installed URL case, as well as
some extra documentation for profile fetching.

BUG=893927

Change-Id: Icb6d98121f9c4347561a31c9ea97af15b10ebdfb
Reviewed-on: https://chromium-review.googlesource.com/c/1292659Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601768}