Read recv timestamps from socket (posix only).

webrtc/base/testclient.h

Index: webrtc/base/testclient.h
diff --git a/webrtc/base/testclient.h b/webrtc/base/testclient.h
index df831fefb75e880533a1038812c6512e08bc8ca3..a698365040c8c8e1a3d851021071728e6476248b 100644
--- a/webrtc/base/testclient.h
+++ b/webrtc/base/testclient.h
@@ -24,13 +24,17 @@ class TestClient : public sigslot::has_slots<> {
  public:
   // Records the contents of a packet that was received.
   struct Packet {
-    Packet(const SocketAddress& a, const char* b, size_t s);
+    Packet(const SocketAddress& a,
+           const char* b,
+           size_t s,
+           const PacketTime& packet_time);
     Packet(const Packet& p);
     virtual ~Packet();
 
     SocketAddress addr;
     char*  buf;
     size_t size;
+    PacketTime packet_time;
   };
 
   // Default timeout for NextPacket reads.
@@ -90,6 +94,7 @@ class TestClient : public sigslot::has_slots<> {
   AsyncPacketSocket* socket_;
   std::vector<Packet*>* packets_;
   bool ready_to_send_;
+  int64_t prev_packet_timestamp_;
   RTC_DISALLOW_COPY_AND_ASSIGN(TestClient);
 };