Break CallStackProfileBuilder.MetadataRecorder test apart

This will make it clearer exactly which behaviors are changing as we
optimize how repeat metadata items are sent.

Bug: 913570
Change-Id: Ia3936b230de35ce9067a7d1839affd6ad538a94d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584616
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654291}
1 file changed