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

gpu/command_buffer/service/gpu_tracer.h

 // 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.
 
 // This file contains the GPUTrace class.
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_
 
 #include <stdint.h>
 
@@ skipping 27 matching lines @@
   kTraceCHROMIUM,
   kTraceDecoder,
   kTraceDisjoint, // Used internally.
 
   NUM_TRACER_SOURCES
 };
 
 // Marker structure for a Trace.
 struct TraceMarker {
   TraceMarker(const std::string& category, const std::string& name);
+  TraceMarker(const TraceMarker& other);
   ~TraceMarker();
 
   std::string category_;
   std::string name_;
   scoped_refptr<GPUTrace> trace_;
 };
 
 // Traces GPU Commands.
 class GPU_EXPORT GPUTracer
     : public base::SupportsWeakPtr<GPUTracer> {
@@ skipping 155 matching lines @@
 
  private:
   GPUTracer* gpu_tracer_;
   GpuTracerSource source_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GPU_TRACER_H_