[runtime] Support Symbols in KeyAccumulator

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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 # Because standalone V8 builds are not supported, assume this is part of a
@@ skipping 1063 matching lines @@
     "src/interpreter/bytecode-traits.h",
     "src/interpreter/control-flow-builders.cc",
     "src/interpreter/control-flow-builders.h",
     "src/interpreter/interpreter.cc",
     "src/interpreter/interpreter.h",
     "src/isolate-inl.h",
     "src/isolate.cc",
     "src/isolate.h",
     "src/json-parser.h",
     "src/json-stringifier.h",
+    "src/key-accumulator.h",
+    "src/key-accumulator.cc",
     "src/layout-descriptor-inl.h",
     "src/layout-descriptor.cc",
     "src/layout-descriptor.h",
     "src/list-inl.h",
     "src/list.h",
     "src/log-inl.h",
     "src/log-utils.cc",
     "src/log-utils.h",
     "src/log.cc",
     "src/log.h",
@@ skipping 744 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }