[Isolates] Fix debugger and termination APIs callable from other threads.

src/isolate.h

 // Copyright 2010 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 413 matching lines @@
   void TearDown();
 
   bool IsDefaultIsolate() const { return this == default_isolate_; }
 
   // Ensures that process-wide resources and the default isolate have been
   // allocated. It is only necessary to call this method in rare casses, for
   // example if you are using V8 from within the body of a static initializer.
   // Safe to call multiple times.
   static void EnsureDefaultIsolate();
 
+  // Get the debugger from the default isolate. Preinitializes the
+  // default isolate if needed.
+  static Debugger* GetDefaultIsolateDebugger();
+
+  // Get the stack guard from the default isolate. Preinitializes the
+  // default isolate if needed.
+  static StackGuard* GetDefaultIsolateStackGuard();
+
   // Returns the key used to store the pointer to the current isolate.
   // Used internally for V8 threads that do not execute JavaScript but still
   // are part of the domain of an isolate (like the context switcher).
   static Thread::LocalStorageKey isolate_key() {
     return isolate_key_;
   }
 
   // Returns the key used to store process-wide thread IDs.
   static Thread::LocalStorageKey thread_id_key() {
     return thread_id_key_;
@@ skipping 842 matching lines @@
 
 } }  // namespace v8::internal
 
 // TODO(isolates): Get rid of these -inl.h includes and place them only where
 //                 they're needed.
 #include "allocation-inl.h"
 #include "zone-inl.h"
 #include "frames-inl.h"
 
 #endif  // V8_ISOLATE_H_