Add more out of line copy ctors for complex classes.

components/mus/ws/test_change_tracker.cc

 // 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.
 
 #include "components/mus/ws/test_change_tracker.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 180 matching lines @@
     : type(CHANGE_TYPE_EMBED),
       connection_id(0),
       window_id(0),
       window_id2(0),
       window_id3(0),
       event_action(0),
       direction(mojom::OrderDirection::ABOVE),
       bool_value(false),
       change_id(0u) {}
 
+Change::Change(const Change& other) = default;
+
 Change::~Change() {}
 
 TestChangeTracker::TestChangeTracker() : delegate_(NULL) {}
 
 TestChangeTracker::~TestChangeTracker() {}
 
 void TestChangeTracker::OnEmbed(ConnectionSpecificId connection_id,
                                 mojom::WindowDataPtr root) {
   Change change;
   change.type = CHANGE_TYPE_EMBED;
@@ skipping 173 matching lines @@
 }
 
 void TestChangeTracker::AddChange(const Change& change) {
   changes_.push_back(change);
   if (delegate_)
     delegate_->OnChangeAdded();
 }
 
 TestWindow::TestWindow() {}
 
+TestWindow::TestWindow(const TestWindow& other) = default;
+
 TestWindow::~TestWindow() {}
 
 std::string TestWindow::ToString() const {
   return base::StringPrintf("window=%s parent=%s",
                             WindowIdToString(window_id).c_str(),
                             WindowIdToString(parent_id).c_str());
 }
 
 std::string TestWindow::ToString2() const {
   return base::StringPrintf(
       "window=%s parent=%s visible=%s drawn=%s",
       WindowIdToString(window_id).c_str(), WindowIdToString(parent_id).c_str(),
       visible ? "true" : "false", drawn ? "true" : "false");
 }
 
 }  // namespace ws
 
 }  // namespace mus