[debugger] add precise mode for code coverage.

src/objects.h

 // Copyright 2015 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 <iosfwd>
 #include <memory>
 
@@ skipping 3011 matching lines @@
  public:
   enum AddMode {
     kNone,
     // Use this if GC can delete elements from the array.
     kReloadLengthAfterAllocation,
   };
   static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj,
                                AddMode mode = kNone);
   static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj1,
                                Handle<Object> obj2, AddMode = kNone);
+  static Handle<ArrayList> New(Isolate* isolate, int size);
   inline int Length();
   inline void SetLength(int length);
   inline Object* Get(int index);
   inline Object** Slot(int index);
   inline void Set(int index, Object* obj,
                   WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
   inline void Clear(int index, Object* undefined);
   bool IsFull();
   DECLARE_CAST(ArrayList)
 
@@ skipping 8588 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_