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

media/base/serial_runner.cc

 // 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.
 
 #include "media/base/serial_runner.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 22 matching lines @@
 static void RunOnTaskRunner(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
     const PipelineStatusCB& status_cb,
     PipelineStatus last_status) {
   // Force post to permit cancellation of a series in the scenario where all
   // bound functions run on the same thread.
   task_runner->PostTask(FROM_HERE, base::Bind(status_cb, last_status));
 }
 
 SerialRunner::Queue::Queue() {}
+SerialRunner::Queue::Queue(const Queue& other) = default;
 SerialRunner::Queue::~Queue() {}
 
 void SerialRunner::Queue::Push(const base::Closure& closure) {
   bound_fns_.push(base::Bind(&RunClosure, closure));
 }
 
 void SerialRunner::Queue::Push(
     const BoundClosure& bound_closure) {
   bound_fns_.push(base::Bind(&RunBoundClosure, bound_closure));
 }
@@ skipping 51 matching lines @@
   }
 
   BoundPipelineStatusCB bound_fn = bound_fns_.Pop();
   bound_fn.Run(base::Bind(
       &RunOnTaskRunner,
       task_runner_,
       base::Bind(&SerialRunner::RunNextInSeries, weak_factory_.GetWeakPtr())));
 }
 
 }  // namespace media