Do not break in native code (including non-builtin debugger code).

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "allocation.h"
 #include "assert-scope.h"
 #include "builtins.h"
@@ skipping 7474 matching lines @@
   // [[Call]] and [[Construct]] description in ECMA-262, section
   // 8.6.2, page 27.
   inline Code* code();
   inline void set_code(Code* code);
   inline void set_code_no_write_barrier(Code* code);
   inline void ReplaceCode(Code* code);
 
   // Tells whether this function is builtin.
   inline bool IsBuiltin();
 
+  // Tells whether this function is defined in a native script.
+  inline bool IsNative();
+
   // Tells whether or not the function needs arguments adaption.
   inline bool NeedsArgumentsAdaption();
 
   // Tells whether or not this function has been optimized.
   inline bool IsOptimized();
 
   // Tells whether or not this function can be optimized.
   inline bool IsOptimizable();
 
   // Mark this function for lazy recompilation. The function will be
@@ skipping 3558 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_