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

gpu/command_buffer/service/gpu_tracer.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 "gpu/command_buffer/service/gpu_tracer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <deque>
@@ skipping 25 matching lines @@
               "Trace source names must match enumeration.");
 
 static TraceOutputter* g_outputter_thread = NULL;
 
 TraceMarker::TraceMarker(const std::string& category, const std::string& name)
     : category_(category),
       name_(name),
       trace_(NULL) {
 }
 
+TraceMarker::TraceMarker(const TraceMarker& other) = default;
+
 TraceMarker::~TraceMarker() {
 }
 
 scoped_refptr<TraceOutputter> TraceOutputter::Create(const std::string& name) {
   if (!g_outputter_thread) {
     g_outputter_thread = new TraceOutputter(name);
   }
   return g_outputter_thread;
 }
 
@@ skipping 354 matching lines @@
   }
 
   while (!finished_traces_.empty()) {
     finished_traces_.front()->Destroy(have_context);
     finished_traces_.pop_front();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu