Add more out of line copy ctors for complex classes.

components/mus/ws/test_change_tracker.h

 // 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.
 
 #ifndef COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_
 #define COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 28 matching lines @@
   CHANGE_TYPE_PROPERTY_CHANGED,
   CHANGE_TYPE_FOCUSED,
   CHANGE_TYPE_CURSOR_CHANGED,
   CHANGE_TYPE_ON_CHANGE_COMPLETED,
   CHANGE_TYPE_ON_TOP_LEVEL_CREATED,
 };
 
 // TODO(sky): consider nuking and converting directly to WindowData.
 struct TestWindow {
   TestWindow();
+  TestWindow(const TestWindow& other);
   ~TestWindow();
 
   // Returns a string description of this.
   std::string ToString() const;
 
   // Returns a string description that includes visible and drawn.
   std::string ToString2() const;
 
   Id parent_id;
   Id window_id;
   bool visible;
   bool drawn;
   std::map<std::string, std::vector<uint8_t>> properties;
 };
 
 // Tracks a call to WindowTreeClient. See the individual functions for the
 // fields that are used.
 struct Change {
   Change();
+  Change(const Change& other);
   ~Change();
 
   ChangeType type;
   ConnectionSpecificId connection_id;
   std::vector<TestWindow> windows;
   Id window_id;
   Id window_id2;
   Id window_id3;
   mojo::Rect bounds;
   mojo::Rect bounds2;
@@ skipping 87 matching lines @@
   std::vector<Change> changes_;
 
   DISALLOW_COPY_AND_ASSIGN(TestChangeTracker);
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_TEST_CHANGE_TRACKER_H_