ui: Add out-of-line copy ctors for complex classes.

ui/ozone/platform/drm/gpu/fake_plane_info.h

 // Copyright 2015 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 UI_OZONE_PLATFORM_DRM_GPU_FAKE_PLANE_INFO_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_FAKE_PLANE_INFO_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 
 namespace ui {
 
 struct FakePlaneInfo {
   FakePlaneInfo(uint32_t plane_id, uint32_t crtc_mask);
   FakePlaneInfo(uint32_t plane_id,
                 uint32_t crtc_mask,
                 const std::vector<uint32_t>& formats);
+  FakePlaneInfo(const FakePlaneInfo& other);
   ~FakePlaneInfo();
 
   uint32_t id;
   uint32_t allowed_crtc_mask;
   std::vector<uint32_t> allowed_formats;
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_FAKE_PLANE_INFO_H_