Workaround for PacketBuffer bug.

webrtc/video/rtp_video_stream_receiver.cc

Index: webrtc/video/rtp_video_stream_receiver.cc
diff --git a/webrtc/video/rtp_video_stream_receiver.cc b/webrtc/video/rtp_video_stream_receiver.cc
index 66df339efe05f050d2cabbd955c9694917019588..d4464ac21dd568d29b249d282cee90fb19661185 100644
--- a/webrtc/video/rtp_video_stream_receiver.cc
+++ b/webrtc/video/rtp_video_stream_receiver.cc
@@ -43,7 +43,9 @@
 namespace webrtc {
 
 namespace {
-constexpr int kPacketBufferStartSize = 32;
+// TODO(philipel): Change kPacketBufferStartSize back to 32 in M63 see:
+//                 crbug.com/752886
+constexpr int kPacketBufferStartSize = 512;
 constexpr int kPacketBufferMaxSixe = 2048;
 }