[histogram] Make histograms more resistant to overflows.
Instead of calculating deltas from cumulative snapshots, store unlogged histogram samples in a separate HistogramSample object. This will reduce overflows from long-running sessions given that data between UMA pings fits into 32-bit integer. BUG=719446 Review-Url: https://codereview.chromium.org/2867303004 Cr-Commit-Position: refs/heads/master@{#471359}
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