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

content/common/gpu/media/vt_video_decode_accelerator_mac.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 CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 100 matching lines @@
     // Size of the decoded frame.
     // TODO(sandersd): visible_rect.
     gfx::Size coded_size;
 
     // VideoToolbox decoded image, if decoding was successful.
     base::ScopedCFTypeRef<CVImageBufferRef> image;
   };
 
   struct Task {
     Task(TaskType type);
+    Task(const Task& other);
     ~Task();
 
     TaskType type;
     linked_ptr<Frame> frame;
   };
 
   struct PictureInfo {
     PictureInfo(uint32_t client_texture_id, uint32_t service_texture_id);
     ~PictureInfo();
 
@@ skipping 137 matching lines @@
   // Declared last to ensure that all weak pointers are invalidated before
   // other destructors run.
   base::WeakPtrFactory<VTVideoDecodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VTVideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_DECODE_ACCELERATOR_H_