MSE: Experimental support for new abort and duration behavior

media/blink/websourcebuffer_impl.cc

Index: media/blink/websourcebuffer_impl.cc
diff --git a/media/blink/websourcebuffer_impl.cc b/media/blink/websourcebuffer_impl.cc
index 48f987eb21c6d07a8d5e473b7721fcc6364a29cd..169ad75fc21fb1c4b1b1cd70867c22e6e7cfdb22 100644
--- a/media/blink/websourcebuffer_impl.cc
+++ b/media/blink/websourcebuffer_impl.cc
@@ -91,6 +91,10 @@ blink::WebTimeRanges WebSourceBufferImpl::buffered() {
   return result;
 }
 
+double WebSourceBufferImpl::highestPresentationTimestamp() {
+  return demuxer_->GetHighestPresentationTimestamp(id_).InSecondsF();
+}
+
 bool WebSourceBufferImpl::evictCodedFrames(double currentPlaybackTime,
                                            size_t newDataSize) {
   return demuxer_->EvictCodedFrames(