Add isolate tag-profile and better handling of errors

runtime/vm/thread_interrupter.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 "vm/simulator.h"
 #include "vm/thread_interrupter.h"
 
 namespace dart {
 
 // Notes:
@@ skipping 202 matching lines @@
 void ThreadInterruptNoOp(const InterruptedThreadState& state, void* data) {
   // NoOp.
 }
 
 
 class ThreadInterrupterVisitIsolates : public IsolateVisitor {
  public:
   ThreadInterrupterVisitIsolates() { }
   void VisitIsolate(Isolate* isolate) {
     ASSERT(isolate != NULL);
-    InterruptableThreadState* state = isolate->thread_state();
-    if (state == NULL) {
-      return;
-    }
-    ASSERT(state->id != Thread::kInvalidThreadId);
-    ThreadInterrupter::InterruptThread(state);
+    isolate->ProfileInterrupt();
   }
 };
 
 
 void ThreadInterrupter::ThreadMain(uword parameters) {
   ASSERT(initialized_);
   InstallSignalHandler();
   if (FLAG_trace_thread_interrupter) {
     OS::Print("ThreadInterrupter thread running.\n");
   }
@@ skipping 17 matching lines @@
   }
   {
     // Signal to main thread we are exiting.
     MonitorLocker shutdown_ml(monitor_);
     thread_running_ = false;
     shutdown_ml.Notify();
   }
 }
 
 }  // namespace dart