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CollectionParams will need to be visible to multiple classes in
metrics/perf, but not outside the CWP code, so it is stored as a top
level class in an internal namespace.

This CL is part of a larger restructuring of the PerfProvider class to
enable additional collectors.

BUG=b:116527691
TEST=Unit tests pass

Change-Id: I625d71685fba2042599c57f27fea0462eabc1f8c
Reviewed-on: https://chromium-review.googlesource.com/c/1343353
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613400}