Add more out of line copy ctors for complex classes.

blimp/client/session/assignment_source.cc

 // Copyright 2016 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 "blimp/client/session/assignment_source.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 158 matching lines @@
     return Assignment();
   }
 
   return assignment;
 }
 
 }  // namespace
 
 Assignment::Assignment() : transport_protocol(TransportProtocol::UNKNOWN) {}
 
+Assignment::Assignment(const Assignment& other) = default;
+
 Assignment::~Assignment() {}
 
 bool Assignment::IsValid() const {
   if (engine_endpoint.address().empty() || engine_endpoint.port() == 0 ||
       transport_protocol == TransportProtocol::UNKNOWN) {
     return false;
   }
   if (transport_protocol == TransportProtocol::SSL && !cert) {
     return false;
   }
@@ skipping 182 matching lines @@
 }
 
 void AssignmentSource::OnJsonParseError(const std::string& error) {
   DLOG(ERROR) << "Error while parsing assigner JSON: " << error;
   base::ResetAndReturn(&callback_)
       .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
 }
 
 }  // namespace client
 }  // namespace blimp