Disable the profiler when a debugger is attached

runtime/vm/thread_interrupter_fuchsia.cc

 // Copyright (c) 2016, 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 "platform/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "vm/thread_interrupter.h"
 
 #include "platform/assert.h"
 
 namespace dart {
 
+bool ThreadInterrupter::IsDebuggerAttached() {
+  return false;
+}
+
 void ThreadInterrupter::InterruptThread(OSThread* thread) {
   UNIMPLEMENTED();
 }
 
 
 void ThreadInterrupter::InstallSignalHandler() {
   UNIMPLEMENTED();
 }
 
 
 void ThreadInterrupter::RemoveSignalHandler() {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)