Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/pc/jsepsessiondescription_unittest.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 210 matching lines @@
   EXPECT_TRUE(jsep_desc_->AddCandidate(&jsep_candidate));
   std::string sdp_with_candidate = Serialize(jsep_desc_.get());
   EXPECT_NE(sdp, sdp_with_candidate);
 
   std::unique_ptr<SessionDescriptionInterface> parsed_jsep_desc(
       DeSerialize(sdp_with_candidate));
   std::string parsed_sdp_with_candidate = Serialize(parsed_jsep_desc.get());
 
   EXPECT_EQ(sdp_with_candidate, parsed_sdp_with_candidate);
 }