[Chromoting] Add SessionPlugin in JingleSession

remoting/protocol/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//media/media_options.gni")
 
 static_library("protocol") {
   sources = [
     "audio_decode_scheduler.cc",
@@ skipping 128 matching lines @@
     "rejecting_authenticator.cc",
     "rejecting_authenticator.h",
     "sdp_message.cc",
     "sdp_message.h",
     "secure_channel_factory.cc",
     "secure_channel_factory.h",
     "session.h",
     "session_config.cc",
     "session_config.h",
     "session_manager.h",
+    "session_plugin.cc",
+    "session_plugin.h",
     "socket_util.cc",
     "socket_util.h",
     "spake2_authenticator.cc",
     "spake2_authenticator.h",
     "ssl_hmac_channel_authenticator.cc",
     "ssl_hmac_channel_authenticator.h",
     "stream_channel_factory.h",
     "stream_message_pipe_adapter.cc",
     "stream_message_pipe_adapter.h",
     "third_party_authenticator_base.cc",
@@ skipping 175 matching lines @@
     "webrtc_transport_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }