Only interrupt thread don't record sample.

runtime/vm/profiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <cstdio>
 
 #include "platform/utils.h"
 
 #include "vm/atomic.h"
 #include "vm/isolate.h"
@@ skipping 115 matching lines @@
   if (profiler_data == NULL) {
     return;
   }
   SampleBuffer* sample_buffer = profiler_data->sample_buffer();
   if (sample_buffer == NULL) {
     return;
   }
   Sample* sample = sample_buffer->ReserveSample();
   sample->Init(Sample::kIsolateStart, isolate, OS::GetCurrentTimeMicros(),
                Thread::GetCurrentThreadId());
-  ThreadInterrupter::Register(RecordSampleInterruptCallback, isolate);
+  ThreadInterrupter::Register(ThreadInterruptNoOp, isolate);
 }
 
 
 void Profiler::EndExecution(Isolate* isolate) {
   if (isolate == NULL) {
     return;
   }
   if (!FLAG_profile) {
     return;
   }
@@ skipping 366 matching lines @@
     return false;
   }
   uintptr_t cursor = reinterpret_cast<uintptr_t>(fp);
   cursor += sizeof(fp);
   bool r = cursor >= lower_bound_ && cursor < stack_upper_;
   return r;
 }
 
 
 }  // namespace dart