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Adds predictors for non-network rebuffer (NNR) and consecutive "bad
windows" with high counts of dropped frames. The predictions will be
compared against configurable thresholds for determining
smooth=true/false for a given MediaDecodingConfiguration.

Bug: 1049339

Change-Id: Ia80a9cdc887c070f8156b58a0da64d02318fda40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2021950
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#749364}