Revert of Revert "[telemetry] Wire TsProxy through telemetry's network stack."

telemetry/telemetry/core/local_server.py

Index: telemetry/telemetry/core/local_server.py
diff --git a/telemetry/telemetry/core/local_server.py b/telemetry/telemetry/core/local_server.py
index 5c20c455f425a3fec67bd9aeacb2dbc9d992e8c4..c8557d969afa1245ddaaefb3168be61fde3065ab 100644
--- a/telemetry/telemetry/core/local_server.py
+++ b/telemetry/telemetry/core/local_server.py
@@ -82,13 +82,15 @@
                                         stdout=subprocess.PIPE)
 
     named_ports = self._GetNamedPortsFromBackend()
-    named_port_pair_map = {'http': None, 'https': None, 'dns': None}
-    for name, port in named_ports:
-      assert name in named_port_pair_map, '%s forwarding is unsupported' % name
-      named_port_pair_map[name] = (forwarders.PortPair(
-          port, local_server_controller.GetRemotePort(port)))
+    http_port = None
+    for p in named_ports:
+      if p.name == 'http':
+        http_port = p.port
+    assert http_port and len(named_ports) == 1, (
+        'Only http port is supported: %s' % named_ports)
     self.forwarder = local_server_controller.CreateForwarder(
-        forwarders.PortPairs(**named_port_pair_map))
+        forwarders.PortPair(http_port,
+                            local_server_controller.GetRemotePort(http_port)))
 
   def _GetNamedPortsFromBackend(self):
     named_ports_json = None
@@ -178,8 +180,8 @@
         import traceback
         traceback.print_exc()
 
-  def CreateForwarder(self, port_pairs):
-    return self._platform_backend.forwarder_factory.Create(port_pairs)
+  def CreateForwarder(self, port_pair):
+    return self._platform_backend.forwarder_factory.Create(port_pair)
 
   def GetRemotePort(self, port):
     return self._platform_backend.GetRemotePort(port)