Adding ElementsAccessor::Shift

src/elements.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_ELEMENTS_H_
 #define V8_ELEMENTS_H_
 
 #include "src/elements-kind.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 131 matching lines @@
                                 uint32_t start, uint32_t end) = 0;
 
   virtual Handle<JSArray> Splice(Handle<JSArray> receiver,
                                  Handle<FixedArrayBase> backing_store,
                                  uint32_t start, uint32_t delete_count,
                                  Arguments* args, uint32_t add_count) = 0;
 
   virtual Handle<Object> Pop(Handle<JSArray> receiver,
                              Handle<FixedArrayBase> backing_store) = 0;
 
+  virtual Handle<Object> Shift(Handle<JSArray> receiver,
+                               Handle<FixedArrayBase> backing_store) = 0;
+
  protected:
   friend class LookupIterator;
 
   static ElementsAccessor* ForArray(FixedArrayBase* array);
 
   virtual uint32_t GetCapacity(JSObject* holder,
                                FixedArrayBase* backing_store) = 0;
 
   // Element handlers distinguish between entries and indices when they
   // manipulate elements. Entries refer to elements in terms of their location
@@ skipping 19 matching lines @@
 void CheckArrayAbuse(Handle<JSObject> obj, const char* op, uint32_t index,
                      bool allow_appending = false);
 
 MUST_USE_RESULT MaybeHandle<Object> ArrayConstructInitializeElements(
     Handle<JSArray> array,
     Arguments* args);
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_H_