[Chromoting] Make ChromotingHost's dependency on libjingle injected, instead of hard-coded.

remoting/host/session_manager_factory.cc

Index: remoting/host/session_manager_factory.cc
diff --git a/remoting/host/session_manager_factory.cc b/remoting/host/session_manager_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6a78cac58a5c8ab8e7d7adc9e3a2d693f8355be4
--- /dev/null
+++ b/remoting/host/session_manager_factory.cc
@@ -0,0 +1,42 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/host/session_manager_factory.h"
+
+#include "net/url_request/url_request_context_getter.h"
+#include "remoting/host/host_port_allocator.h"
+#include "remoting/host/network_settings.h"
+#include "remoting/protocol/libjingle_transport_factory.h"
+#include "remoting/protocol/jingle_session_manager.h"
+
+namespace remoting {
+
+scoped_ptr<protocol::SessionManager> CreateHostSessionManager(
+    const NetworkSettings& network_settings,
+    const scoped_refptr<net::URLRequestContextGetter>&
+        url_request_context_getter) {
+  // Create a cricket::PortAllocator that uses Chrome's network stack.

[Wez, 2012/06/14 01:00:58]

nit: Suggest "Use Chrome's network stack to allocate ports for peer-to-peer
channels."

[simonmorris, 2012/06/14 01:24:02]

Done.

+  scoped_ptr<HostPortAllocator> port_allocator(
+      HostPortAllocator::Create(url_request_context_getter,
+                                network_settings));
+
+  bool incoming_only = network_settings.nat_traversal_mode ==
+      NetworkSettings::NAT_TRAVERSAL_DISABLED;

[Wez, 2012/06/14 01:00:58]

nit: Add a comment e.g. "Use libjingle for negotiation of peer-to-peer channels
over HostPortAllocator allocated ports."

[simonmorris, 2012/06/14 01:24:02]

Done.

+
+  scoped_ptr<protocol::TransportFactory> transport_factory(
+      new protocol::LibjingleTransportFactory(
+          port_allocator.PassAs<cricket::HttpPortAllocatorBase>(),
+          incoming_only));
+
+  // Create a Jingle-protocol SessionManager that uses the libjingle
+  // TransportFactory.

[Wez, 2012/06/14 01:00:58]

nit: Suggest "Use the Jingle protocol for channel-negotiation signalling between
peer TransportFactories."

(Sorry; reading this back I realise the comment I suggested previously was not
very clear ):

[simonmorris, 2012/06/14 01:24:02]

Done.

+  bool fetch_stun_relay_info = network_settings.nat_traversal_mode ==
+      NetworkSettings::NAT_TRAVERSAL_ENABLED;
+  scoped_ptr<protocol::JingleSessionManager> session_manager(

[Wez, 2012/06/14 01:00:58]

nit: Add a blank line after the fetch_stun_relay_info definition, or remove the
one after incoming_only, for consistency.

[simonmorris, 2012/06/14 01:24:02]

Done.

+      new protocol::JingleSessionManager(
+          transport_factory.Pass(), fetch_stun_relay_info));
+  return session_manager.PassAs<protocol::SessionManager>();
+}
+
+} // namespace remoting