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This will hopefully illuminate some of the problems inherent with the low resolution clock on windows.

If filtering by high resolution proves to be an effective way to de-noise UMA, we can come up with next steps and potentially migrate more histograms to use this model (or allow post-processing filtering).

For now, we will only bucket FirstContentfulPaint, as we think it's our best metric to date.

BUG=394757

Review URL: https://codereview.chromium.org/1473443002

Cr-Commit-Position: refs/heads/master@{#361241}