Introduce safe interface to "copy and grow" FixedArray.

src/factory.h

 // Copyright 2014 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_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 #include "src/messages.h"
 
@@ skipping 304 matching lines @@
   Handle<JSObject> NewFunctionPrototype(Handle<JSFunction> function);
 
   Handle<JSObject> CopyJSObject(Handle<JSObject> object);
 
   Handle<JSObject> CopyJSObjectWithAllocationSite(Handle<JSObject> object,
                                                   Handle<AllocationSite> site);
 
   Handle<FixedArray> CopyFixedArrayWithMap(Handle<FixedArray> array,
                                            Handle<Map> map);
 
+  Handle<FixedArray> CopyFixedArrayAndGrow(Handle<FixedArray> array,
+                                           int grow_by);
+
   Handle<FixedArray> CopyFixedArray(Handle<FixedArray> array);
 
   // This method expects a COW array in new space, and creates a copy
   // of it in old space.
   Handle<FixedArray> CopyAndTenureFixedCOWArray(Handle<FixedArray> array);
 
   Handle<FixedDoubleArray> CopyFixedDoubleArray(
       Handle<FixedDoubleArray> array);
 
   // Numbers (e.g. literals) are pretenured by the parser.
@@ skipping 414 matching lines @@
   // Reinitialize a JSProxy into an (empty) JS object of respective type and
   // size, but keeping the original prototype.  The receiver must have at least
   // the size of the new object.  The object is reinitialized and behaves as an
   // object that has been freshly allocated.
   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_