Read recv timestamps from socket (posix only).

webrtc/base/socket.h

Index: webrtc/base/socket.h
diff --git a/webrtc/base/socket.h b/webrtc/base/socket.h
index 22326cb997a1a0aa3ca6388d5746dba950e77434..7db9459de7ca84b4b8dff3db847b450816f563fd 100644
--- a/webrtc/base/socket.h
+++ b/webrtc/base/socket.h
@@ -151,8 +151,11 @@ class Socket {
   virtual int Connect(const SocketAddress& addr) = 0;
   virtual int Send(const void *pv, size_t cb) = 0;
   virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr) = 0;
-  virtual int Recv(void *pv, size_t cb) = 0;
-  virtual int RecvFrom(void *pv, size_t cb, SocketAddress *paddr) = 0;
+  virtual int Recv(void* pv, size_t cb, int64_t* timestamp) = 0;
+  virtual int RecvFrom(void* pv,
+                       size_t cb,
+                       SocketAddress* paddr,
+                       int64_t* timestamp) = 0;
   virtual int Listen(int backlog) = 0;
   virtual Socket *Accept(SocketAddress *paddr) = 0;
   virtual int Close() = 0;