Add more out of line copy ctors for complex classes.

cc/tiles/software_image_decode_controller.cc

 // 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.
 
 #include "cc/tiles/software_image_decode_controller.h"
 
 #include <stdint.h>
 
 #include <functional>
 
@@ skipping 803 matching lines @@
             base::HashInts(src_rect_.width(), src_rect_.height())));
 
     uint64_t target_size_hash =
         base::HashInts(target_size_.width(), target_size_.height());
 
     hash_ = base::HashInts(base::HashInts(src_rect_hash, target_size_hash),
                            base::HashInts(image_id_, filter_quality_));
   }
 }
 
+ImageDecodeControllerKey::ImageDecodeControllerKey(
+    const ImageDecodeControllerKey& other) = default;
+
 std::string ImageDecodeControllerKey::ToString() const {
   std::ostringstream str;
   str << "id[" << image_id_ << "] src_rect[" << src_rect_.x() << ","
       << src_rect_.y() << " " << src_rect_.width() << "x" << src_rect_.height()
       << "] target_size[" << target_size_.width() << "x"
       << target_size_.height() << "] filter_quality[" << filter_quality_
       << "] can_use_original_decode [" << can_use_original_decode_ << "] hash ["
       << hash_ << "]";
   return str.str();
 }
@@ skipping 53 matching lines @@
 void SoftwareImageDecodeController::MemoryBudget::ResetUsage() {
   current_usage_bytes_ = 0;
 }
 
 size_t SoftwareImageDecodeController::MemoryBudget::GetCurrentUsageSafe()
     const {
   return current_usage_bytes_.ValueOrDie();
 }
 
 }  // namespace cc