Give performance_browser_tests lots of love and attention.

media/cast/test/utility/udp_proxy.cc

Index: media/cast/test/utility/udp_proxy.cc
diff --git a/media/cast/test/utility/udp_proxy.cc b/media/cast/test/utility/udp_proxy.cc
index 2d2dda7e12e4f70cf401860ad108cdae124f1f8b..7468e65dcf0a5e452963c3137a8d058db4f2ca66 100644
--- a/media/cast/test/utility/udp_proxy.cc
+++ b/media/cast/test/utility/udp_proxy.cc
@@ -594,6 +594,23 @@ std::unique_ptr<PacketPipe> WifiNetwork() {
   return pipe;
 }
 
+std::unique_ptr<PacketPipe> SlowNetwork() {
+  // This represents the buffer on the sender.
+  std::unique_ptr<PacketPipe> pipe;
+  BuildPipe(&pipe, new Buffer(256 << 10, 1.5));
+  BuildPipe(&pipe, new RandomDrop(0.005));
+  // This represents the buffer on the router.
+  BuildPipe(&pipe, new ConstantDelay(10E-3));
+  BuildPipe(&pipe, new RandomSortedDelay(10E-3, 20E-3, 3));
+  BuildPipe(&pipe, new Buffer(256 << 10, 20));
+  BuildPipe(&pipe, new ConstantDelay(10E-3));
+  BuildPipe(&pipe, new RandomSortedDelay(10E-3, 20E-3, 3));
+  BuildPipe(&pipe, new RandomDrop(0.005));
+  // This represents the buffer on the receiving device.
+  BuildPipe(&pipe, new Buffer(256 << 10, 20));
+  return pipe;
+}
+
 std::unique_ptr<PacketPipe> BadNetwork() {
   std::unique_ptr<PacketPipe> pipe;
   // This represents the buffer on the sender.