Debugger: require debugger to be active when dealing with breaks.

test/cctest/cctest.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 557 matching lines @@
   while (!marking->IsComplete()) {
     marking->Step(i::MB, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD);
     if (marking->IsReadyToOverApproximateWeakClosure()) {
       marking->MarkObjectGroups();
     }
   }
   CHECK(marking->IsComplete());
 }
 
 
+static void DummyDebugEventListener(
+    const v8::Debug::EventDetails& event_details) {}
+
+
+static inline void EnableDebugger() {
+  v8::Debug::SetDebugEventListener(&DummyDebugEventListener);
+}
+
+
+static inline void DisableDebugger() { v8::Debug::SetDebugEventListener(NULL); }
+
+
 // Helper class for new allocations tracking and checking.
 // To use checking of JS allocations tracking in a test,
 // just create an instance of this class.
 class HeapObjectsTracker {
  public:
   HeapObjectsTracker() {
     heap_profiler_ = i::Isolate::Current()->heap_profiler();
     CHECK_NOT_NULL(heap_profiler_);
     heap_profiler_->StartHeapObjectsTracking(true);
   }
@@ skipping 29 matching lines @@
   HandleAndZoneScope() {}
 
   // Prefixing the below with main_ reduces a lot of naming clashes.
   i::Zone* main_zone() { return &main_zone_; }
 
  private:
   i::Zone main_zone_;
 };
 
 #endif  // ifndef CCTEST_H_