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Most if not all sync integration tests output this red-herring and
annoying trace:
"Skipping unexpected progress marker for non-enabled type <type>".

The reason is that, prior to this patch, the loopback server returned
progress markers for all datatypes that the server knows about (i.e. at
least one entity exists).

Instead, let's mimic the real server and return progress markers for
types that have been requested by the client.

Bug: None
Change-Id: I7354c0f38afbd71cf06ab3e7e7c4113f44db6ee2
Reviewed-on: https://chromium-review.googlesource.com/c/1296545
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602295}