Bug 1064699 - Update mLastVideoFrameTime after it's used for computing the frame duration.
Bug 1064705 - Don't treat EOS as fatal when reading optional block subelements in nestegg_read_packet.
Bug 1062666 - Add a debug-only dump method to MediaSource for debugging issues with appended data.
Bug 1062657 - Switch internal SourceBuffer timestamp handling from double/seconds to int64_t/microseconds.
Bug 1065218 - Convert MediaSourceReader timestamp handling to int64_t/microseconds.
Bug 1065219 - Move track format rejection from switch to init time.
wip - bug 1063323