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 72ce4ebb7c9aaf43f944a0042d3f5c6c18e0e9de..b4340872f5774e2a0325a5ea46df28213569e00f 100644
--- a/webrtc/base/win32socketserver.cc
+++ b/webrtc/base/win32socketserver.cc
@@ -438,7 +438,8 @@ 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) {
+  *timestamp = -1;
   int received = ::recv(socket_, static_cast<char*>(buffer),
                         static_cast<int>(length), 0);
   UpdateLastError();
@@ -447,8 +448,11 @@ 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) {
+  *timestamp = -1;
   sockaddr_storage saddr;
   socklen_t addr_len = sizeof(saddr);
   int received = ::recvfrom(socket_, static_cast<char*>(buffer),