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We have observed on some Mac that video frames are delivered back to back from the build in video capture device. This can potentially happen on all platforms. If that happen, the simple filter used for frame rate calculation get scewed. This cl fix that by dropping all frames received within 5ms of the previous frame.

BUG=394315

Review URL: https://codereview.chromium.org/516783002

Cr-Commit-Position: refs/heads/master@{#292361}