Only create the GPUTracer outputer when actually tracing

gpu/command_buffer/service/gpu_tracer.cc

Index: gpu/command_buffer/service/gpu_tracer.cc
diff --git a/gpu/command_buffer/service/gpu_tracer.cc b/gpu/command_buffer/service/gpu_tracer.cc
index ac459c0138a722d4fe636c368bf80a273295f0ea..aa85a88fe0c78a98da85f465891a96c1c4aa7c29 100644
--- a/gpu/command_buffer/service/gpu_tracer.cc
+++ b/gpu/command_buffer/service/gpu_tracer.cc
@@ -211,12 +211,12 @@ 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++) {