Implement set trap for proxies, and revamp class hierarchy in preparation

src/handles.h

 // Copyright 2006-2008 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 167 matching lines @@
                          Handle<Object> value,
                          PropertyDetails details);
 
 // Flattens a string.
 void FlattenString(Handle<String> str);
 
 // Flattens a string and returns the underlying external or sequential
 // string.
 Handle<String> FlattenGetString(Handle<String> str);
 
-Handle<Object> SetProperty(Handle<JSObject> object,
+Handle<Object> SetProperty(Handle<JSReceiver> object,
                            Handle<String> key,
                            Handle<Object> value,
                            PropertyAttributes attributes,
                            StrictModeFlag strict_mode);
 
 Handle<Object> SetProperty(Handle<Object> object,
                            Handle<Object> key,
                            Handle<Object> value,
                            PropertyAttributes attributes,
                            StrictModeFlag strict_mode);
@@ skipping 33 matching lines @@
 MUST_USE_RESULT Handle<Object> SetElement(Handle<JSObject> object,
                                           uint32_t index,
                                           Handle<Object> value,
                                           StrictModeFlag strict_mode);
 
 Handle<Object> SetOwnElement(Handle<JSObject> object,
                              uint32_t index,
                              Handle<Object> value,
                              StrictModeFlag strict_mode);
 
-Handle<Object> GetProperty(Handle<JSObject> obj,
+Handle<Object> GetProperty(Handle<JSReceiver> obj,
                            const char* name);
 
 Handle<Object> GetProperty(Handle<Object> obj,
-                           const char* name,
-                           LookupResult* result);
-
-Handle<Object> GetProperty(Handle<Object> obj,
                            Handle<Object> key);
 
-Handle<Object> GetProperty(Handle<JSObject> obj,
+Handle<Object> GetProperty(Handle<JSReceiver> obj,
                            Handle<String> name,
                            LookupResult* result);
 
 
 Handle<Object> GetElement(Handle<Object> obj,
                           uint32_t index);
 
 Handle<Object> GetPropertyWithInterceptor(Handle<JSObject> receiver,
                                           Handle<JSObject> holder,
                                           Handle<String> name,
@@ skipping 110 matching lines @@
   inline NoHandleAllocation();
   inline ~NoHandleAllocation();
  private:
   int level_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_