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The new roughness and freezing metrics require longer playback
stories. The memoryMetric is not measured for these stories.

Add measure_memory parameter to allow this to be changed per story
instead of needing a new subclass of _MediaPage.

Reformat code per presubmit checks.

Change-Id: Ia81aaa6a372596b2a27e181413035fe16c4129d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594169Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Krystal Loh <kxloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839139}