Add more out of line copy ctors for complex classes.

cc/surfaces/surface_manager.cc

 // 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.
 
 #include "cc/surfaces/surface_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_id_allocator.h"
 
 namespace cc {
 
 SurfaceManager::ClientSourceMapping::ClientSourceMapping()
     : client(nullptr), source(nullptr) {}
 
+SurfaceManager::ClientSourceMapping::ClientSourceMapping(
+    const ClientSourceMapping& other) = default;
+
 SurfaceManager::ClientSourceMapping::~ClientSourceMapping() {
   DCHECK(is_empty()) << "client: " << client
                      << ", children: " << children.size();
 }
 
 SurfaceManager::SurfaceManager() {
   thread_checker_.DetachFromThread();
 }
 
 SurfaceManager::~SurfaceManager() {
@@ skipping 299 matching lines @@
 
 bool SurfaceManager::SurfaceModified(SurfaceId surface_id) {
   CHECK(thread_checker_.CalledOnValidThread());
   bool changed = false;
   FOR_EACH_OBSERVER(SurfaceDamageObserver, observer_list_,
                     OnSurfaceDamaged(surface_id, &changed));
   return changed;
 }
 
 }  // namespace cc