Add a flag to track detached contexts.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include "include/v8-debug.h"
 #include "src/allocation.h"
@@ skipping 1123 matching lines @@
 
   void set_store_buffer_hash_set_2_address(
       uintptr_t* store_buffer_hash_set_2_address) {
     store_buffer_hash_set_2_address_ = store_buffer_hash_set_2_address;
   }
 
   uintptr_t* store_buffer_hash_set_2_address() {
     return store_buffer_hash_set_2_address_;
   }
 
+  void AddDetachedContext(Handle<Context> context);
+  void CheckDetachedContextsAfterGC();
+
  private:
   explicit Isolate(bool enable_serializer);
 
   friend struct GlobalState;
   friend struct InitializeGlobalState;
 
   // These fields are accessed through the API, offsets must be kept in sync
   // with v8::internal::Internals (in include/v8.h) constants. This is also
   // verified in Isolate::Init() using runtime checks.
   void* embedder_data_[Internals::kNumIsolateDataSlots];
@@ skipping 201 matching lines @@
 #if TRACE_MAPS
   int next_unique_sfi_id_;
 #endif
 
   // List of callbacks when a Call completes.
   List<CallCompletedCallback> call_completed_callbacks_;
 
   v8::Isolate::UseCounterCallback use_counter_callback_;
   BasicBlockProfiler* basic_block_profiler_;
 
+
   friend class ExecutionAccess;
   friend class HandleScopeImplementer;
   friend class OptimizingCompilerThread;
   friend class SweeperThread;
   friend class ThreadManager;
   friend class Simulator;
   friend class StackGuard;
   friend class ThreadId;
   friend class TestMemoryAllocatorScope;
   friend class TestCodeRangeScope;
@@ skipping 207 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_