Disable the profiler when a debugger is attached

runtime/vm/thread_interrupter_win.cc

Index: runtime/vm/thread_interrupter_win.cc
diff --git a/runtime/vm/thread_interrupter_win.cc b/runtime/vm/thread_interrupter_win.cc
index bcbcc778b7a135f4cbedbda0725e623c0f693c81..964a405d8d4b232738f3c8443de433b226d6e694 100644
--- a/runtime/vm/thread_interrupter_win.cc
+++ b/runtime/vm/thread_interrupter_win.cc
@@ -63,8 +63,8 @@ class ThreadInterrupterWin : public AllStatic {
     DWORD result = SuspendThread(handle);
     if (result == kThreadError) {
       if (FLAG_trace_thread_interrupter) {
-        OS::Print("ThreadInterrupter failed to suspend thread %p\n",
-                  reinterpret_cast<void*>(os_thread->id()));
+        OS::PrintErr("ThreadInterrupter failed to suspend thread %p\n",
+                     reinterpret_cast<void*>(os_thread->id()));
       }
       CloseHandle(handle);
       return;
@@ -74,8 +74,8 @@ class ThreadInterrupterWin : public AllStatic {
       // Failed to get thread registers.
       ResumeThread(handle);
       if (FLAG_trace_thread_interrupter) {
-        OS::Print("ThreadInterrupter failed to get registers for %p\n",
-                  reinterpret_cast<void*>(os_thread->id()));
+        OS::PrintErr("ThreadInterrupter failed to get registers for %p\n",
+                     reinterpret_cast<void*>(os_thread->id()));
       }
       CloseHandle(handle);
       return;
@@ -93,15 +93,20 @@ class ThreadInterrupterWin : public AllStatic {
 };
 
 
+bool ThreadInterrupter::IsDebuggerAttached() {
+  return false;
+}
+
+
 void ThreadInterrupter::InterruptThread(OSThread* thread) {
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter suspending %p\n",
-              reinterpret_cast<void*>(thread->id()));
+    OS::PrintErr("ThreadInterrupter suspending %p\n",
+                 reinterpret_cast<void*>(thread->id()));
   }
   ThreadInterrupterWin::Interrupt(thread);
   if (FLAG_trace_thread_interrupter) {
-    OS::Print("ThreadInterrupter resuming %p\n",
-              reinterpret_cast<void*>(thread->id()));
+    OS::PrintErr("ThreadInterrupter resuming %p\n",
+                 reinterpret_cast<void*>(thread->id()));
   }
 }