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This is the high level helper class that will be used by all
frame sources that we want to instrument.

It takes in timing information about frames produced and
displayed and calculates metrics for a frame's throughput,
latency, latency speed, and latency acceleration.

It forwards those computations to StreamAnalyzers which
compute statistics of each metric over time, including
mean, RMS, standard deviation, percentiles, and worst
performing time period.

Bug: 790761
Change-Id: Ibe2980e861acf0af3904b1e8d8caf134d9ef141b
Reviewed-on: https://chromium-review.googlesource.com/979120Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Brian Anderson <brianderson@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Commit-Queue: Brian Anderson <brianderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555561}