Add more out of line copy ctors for complex classes.

gpu/ipc/common/memory_stats.h

 // Copyright (c) 2012 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 GPU_IPC_COMMON_MEMORY_STATS_H_
 #define GPU_IPC_COMMON_MEMORY_STATS_H_
 
 // Provides access to the GPU information for the system
 // on which chrome is currently running.
 
 #include <stddef.h>
 
 #include <map>
 
 #include "base/process/process.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 
 // Note: we use uint64_t instead of size_t for byte count because this struct
 // is sent over IPC which could span 32 & 64 bit processes.
 struct GPU_EXPORT VideoMemoryUsageStats {
   VideoMemoryUsageStats();
+  VideoMemoryUsageStats(const VideoMemoryUsageStats& other);
   ~VideoMemoryUsageStats();
 
   struct GPU_EXPORT ProcessStats {
     ProcessStats();
     ~ProcessStats();
 
     // The bytes of GPU resources accessible by this process
     uint64_t video_memory;
 
     // Set to true if this process' GPU resource count is inflated because
     // it is counting other processes' resources (e.g, the GPU process has
     // duplicate set to true because it is the aggregate of all processes)
     bool has_duplicates;
   };
   typedef std::map<base::ProcessId, ProcessStats> ProcessMap;
 
   // A map of processes to their GPU resource consumption
   ProcessMap process_map;
 
   // The total amount of GPU memory allocated at the time of the request.
   uint64_t bytes_allocated;
 
   // The maximum amount of GPU memory ever allocated at once.
   uint64_t bytes_allocated_historical_max;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_COMMON_MEMORY_STATS_H_