Reland "Add base::TimeDelta::Max()"

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index ca16d51dd21caaa7cbdcf9d9fb265606d2a60dcd..2e22cd834f5b69ad66f0a2a95b00207e94d5fcbd 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -1537,6 +1537,7 @@ void ChunkDemuxer::SetDuration(double duration) {
   // This can be different if the value of |duration| doesn't fit the range or
   // precision of TimeDelta.
   TimeDelta min_duration = TimeDelta::FromInternalValue(1);
+  // Don't use TimeDelta::Max() here, as we want the largest finite time delta.
   TimeDelta max_duration = TimeDelta::FromInternalValue(kint64max - 1);
   double min_duration_in_seconds = min_duration.InSecondsF();
   double max_duration_in_seconds = max_duration.InSecondsF();