Read recv timestamps from socket (posix only).

webrtc/base/win32socketserver.cc

Index: webrtc/base/win32socketserver.cc
diff --git a/webrtc/base/win32socketserver.cc b/webrtc/base/win32socketserver.cc
index 5423eed9bf08561263588a8f6c9c707b51724d08..ab25312df0e7925c3418471f716be8dc15b5a529 100644
--- a/webrtc/base/win32socketserver.cc
+++ b/webrtc/base/win32socketserver.cc
@@ -438,7 +438,10 @@ int Win32Socket::SendTo(const void* buffer, size_t length,
   return sent;
 }
 
-int Win32Socket::Recv(void* buffer, size_t length) {
+int Win32Socket::Recv(void* buffer, size_t length, int64_t* timestamp) {
+  if (timestamp) {
+    *timestamp = -1;
+  }
   int received = ::recv(socket_, static_cast<char*>(buffer),
                         static_cast<int>(length), 0);
   UpdateLastError();
@@ -447,8 +450,13 @@ int Win32Socket::Recv(void* buffer, size_t length) {
   return received;
 }
 
-int Win32Socket::RecvFrom(void* buffer, size_t length,
-                          SocketAddress* out_addr) {
+int Win32Socket::RecvFrom(void* buffer,
+                          size_t length,
+                          SocketAddress* out_addr,
+                          int64_t* timestamp) {
+  if (timestamp) {
+    *timestamp = -1;
+  }
   sockaddr_storage saddr;
   socklen_t addr_len = sizeof(saddr);
   int received = ::recvfrom(socket_, static_cast<char*>(buffer),