[heap, debugger] Introduce out-of-memory listener for debugger.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index b8d9166cb7e3d342e6d4e886d70bb74daf2d3679..65f79ecc5c2d31f4668bb451ca92e455141ddb72 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -14,6 +14,7 @@
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/base/atomic-utils.h"
+#include "src/debug/debug-interface.h"
 #include "src/globals.h"
 #include "src/heap-symbols.h"
 #include "src/list.h"
@@ -846,6 +847,9 @@ class Heap {
                                   bool is_isolate_locked);
   void CheckMemoryPressure();
 
+  void SetOutOfMemoryCallback(v8::debug::OutOfMemoryCallback callback,
+                              void* data);
+
   double MonotonicallyIncreasingTimeInMs();
 
   void RecordStats(HeapStats* stats, bool take_snapshot = false);
@@ -1759,6 +1763,8 @@ class Heap {
 
   void CollectGarbageOnMemoryPressure();
 
+  void InvokeOutOfMemoryCallback();
+
   // Attempt to over-approximate the weak closure by marking object groups and
   // implicit references from global handles, but don't atomically complete
   // marking. If we continue to mark incrementally, we might have marked
@@ -2169,6 +2175,9 @@ class Heap {
   // and reset by a mark-compact garbage collection.
   base::AtomicValue<MemoryPressureLevel> memory_pressure_level_;
 
+  v8::debug::OutOfMemoryCallback out_of_memory_callback_;
+  void* out_of_memory_callback_data_;
+
   // For keeping track of context disposals.
   int contexts_disposed_;