Add last OS error into heap stats.

src/api.cc

 // Copyright 2009 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 156 matching lines @@
   int destroyed_global_handle_count;
   heap_stats.destroyed_global_handle_count = &destroyed_global_handle_count;
   int memory_allocator_size;
   heap_stats.memory_allocator_size = &memory_allocator_size;
   int memory_allocator_capacity;
   heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
   int objects_per_type[LAST_TYPE + 1] = {0};
   heap_stats.objects_per_type = objects_per_type;
   int size_per_type[LAST_TYPE + 1] = {0};
   heap_stats.size_per_type = size_per_type;
+  int os_error;
+  heap_stats.os_error = &os_error;
   int end_marker;
   heap_stats.end_marker = &end_marker;
   i::Heap::RecordStats(&heap_stats, take_snapshot);
   i::V8::SetFatalError();
   FatalErrorCallback callback = GetFatalErrorHandler();
   {
     LEAVE_V8;
     callback(location, "Allocation failed - process out of memory");
   }
   // If the callback returns, we stop execution.
@@ skipping 4620 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal