Don't unload debug context after it was requested through public API

test/cctest/test-debug.cc

 // Copyright 2007-2008 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 6121 matching lines @@
 
   break_point_hit_count = 0;
   foo->Call(env->Global(), 0, NULL);
   CHECK_EQ(1, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   debugee_context = v8::Handle<v8::Context>();
   debugger_context = v8::Handle<v8::Context>();
   CheckDebuggerUnloaded();
 }
+
+
+TEST(DebugContextIsPreservedBetweenAccesses) {
+  v8::HandleScope scope;
+  v8::Local<v8::Context> context1 = v8::Debug::GetDebugContext();
+  v8::Local<v8::Context> context2 = v8::Debug::GetDebugContext();
+  CHECK_EQ(*context1, *context2);
+}
+