Bug 1397793 - Share SharedBuffer accross SourceMediaStream. r=pehrsons

MozReview-Commit-ID: 4PEjwiA6PR8

--HG--
extra : rebase_source : 8c3d3f15eaa926f35311b66026f4d3aa10ce3ffa
extra : source : 81889a72ac45db0507c38423084f3cfce71d2ecd

dom/media/webrtc/MediaEngineWebRTCAudio.cpp

@@ -904,7 +904,8 @@ MediaEngineWebRTCMicrophoneSource::PacketizeAndProcess(MediaStreamGraph* aGraph,
       // We already have planar audio data of the right format. Insert into the
       // MSG.
       MOZ_ASSERT(processedOutputChannelPointers.Length() == aChannels);
-      segment.AppendFrames(buffer.forget(),
+      RefPtr<SharedBuffer> other = buffer;
+      segment.AppendFrames(other.forget(),
                            processedOutputChannelPointersConst,
                            mPacketizer->PacketSize(),
                            mPrincipalHandles[i]);