Read recv timestamps from socket (posix only).

webrtc/base/physicalsocketserver.h

Index: webrtc/base/physicalsocketserver.h
diff --git a/webrtc/base/physicalsocketserver.h b/webrtc/base/physicalsocketserver.h
index f5867d25f924eb85d61059365c02151cf43632c1..3437eb8cb3e0392a3fa7538b81928d0856157957 100644
--- a/webrtc/base/physicalsocketserver.h
+++ b/webrtc/base/physicalsocketserver.h
@@ -143,8 +143,11 @@ class PhysicalSocket : public AsyncSocket, public sigslot::has_slots<> {
              size_t length,
              const SocketAddress& addr) override;
 
-  int Recv(void* buffer, size_t length) override;
-  int RecvFrom(void* buffer, size_t length, SocketAddress* out_addr) override;
+  int Recv(void* buffer, size_t length, int64_t* timestamp) override;
+  int RecvFrom(void* buffer,
+               size_t length,
+               SocketAddress* out_addr,
+               int64_t* timestamp) override;
 
   int Listen(int backlog) override;
   AsyncSocket* Accept(SocketAddress* out_addr) override;