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Originally, we delayed the rendering and waited for the late coming frames. However, when play with audio, the late coming frame should be just dropped to keep the AV sync. So we change to drop a frame if it comes too late.

BUG=411123
TEST=Run vda_unittest on peach_pit.

Review URL: https://codereview.chromium.org/562173003

Cr-Commit-Position: refs/heads/master@{#294992}