Introduce a PrototypeIterator class and use it for prototype access

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 668 matching lines @@
     "src/preparser.cc",
     "src/preparser.h",
     "src/prettyprinter.cc",
     "src/prettyprinter.h",
     "src/profile-generator-inl.h",
     "src/profile-generator.cc",
     "src/profile-generator.h",
     "src/property-details.h",
     "src/property.cc",
     "src/property.h",
+    "src/prototype.h",
     "src/regexp-macro-assembler-irregexp-inl.h",
     "src/regexp-macro-assembler-irregexp.cc",
     "src/regexp-macro-assembler-irregexp.h",
     "src/regexp-macro-assembler-tracer.cc",
     "src/regexp-macro-assembler-tracer.h",
     "src/regexp-macro-assembler.cc",
     "src/regexp-macro-assembler.h",
     "src/regexp-stack.cc",
     "src/regexp-stack.h",
     "src/rewriter.cc",
@@ skipping 477 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }