Only create the GPUTracer outputer when actually tracing

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 193 matching lines @@
 }
 
 void GPUTracer::Destroy(bool have_context) {
   ClearOngoingTraces(have_context);
 }
 
 bool GPUTracer::BeginDecoding() {
   if (gpu_executing_)
     return false;
 
-  if (!outputter_) {
-    outputter_ = CreateOutputter(gpu_timing_client_->GetTimerTypeName());
-  }
-
   gpu_executing_ = true;
   if (IsTracing()) {
+    if (!outputter_) {
+      outputter_ = CreateOutputter(gpu_timing_client_->GetTimerTypeName());
+    }
+
     CheckDisjointStatus();
     // Begin a Trace for all active markers
     for (int n = 0; n < NUM_TRACER_SOURCES; n++) {
       for (size_t i = 0; i < markers_[n].size(); i++) {
         began_device_traces_ |= (*gpu_trace_dev_category != 0);
         TraceMarker& trace_marker = markers_[n][i];
         trace_marker.trace_ =
             new GPUTrace(outputter_, gpu_timing_client_.get(),
                          static_cast<GpuTracerSource>(n),
                          trace_marker.category_, trace_marker.name_,
@@ skipping 182 matching lines @@
   }
 
   while (!finished_traces_.empty()) {
     finished_traces_.front()->Destroy(have_context);
     finished_traces_.pop_front();
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu