Add more out of line copy ctors for complex classes.

cc/tiles/software_image_decode_controller.h

 // Copyright 2016 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 CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 #define CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <unordered_map>
@@ skipping 15 matching lines @@
 namespace cc {
 
 // ImageDecodeControllerKey is a class that gets a cache key out of a given draw
 // image. That is, this key uniquely identifies an image in the cache. Note that
 // it's insufficient to use SkImage's unique id, since the same image can appear
 // in the cache multiple times at different scales and filter qualities.
 class CC_EXPORT ImageDecodeControllerKey {
  public:
   static ImageDecodeControllerKey FromDrawImage(const DrawImage& image);
 
+  ImageDecodeControllerKey(const ImageDecodeControllerKey& other);
+
   bool operator==(const ImageDecodeControllerKey& other) const {
     // The image_id always has to be the same. However, after that all original
     // decodes are the same, so if we can use the original decode, return true.
     // If not, then we have to compare every field.
     return image_id_ == other.image_id_ &&
            can_use_original_decode_ == other.can_use_original_decode_ &&
            (can_use_original_decode_ ||
             (src_rect_ == other.src_rect_ &&
              target_size_ == other.target_size_ &&
              filter_quality_ == other.filter_quality_));
@@ skipping 176 matching lines @@
   // image the first time we see it. This mimics the previous behavior and
   // should over time change as the compositor starts to handle more cases.
   std::unordered_set<uint32_t> prerolled_images_;
 
   ResourceFormat format_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_