[json] move json parser and stringifier into own compilation units.

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")
 
 if (is_android) {
@@ skipping 1246 matching lines @@
     "src/interpreter/interpreter-assembler.h",
     "src/interpreter/interpreter-intrinsics.cc",
     "src/interpreter/interpreter-intrinsics.h",
     "src/interpreter/interpreter.cc",
     "src/interpreter/interpreter.h",
     "src/interpreter/source-position-table.cc",
     "src/interpreter/source-position-table.h",
     "src/isolate-inl.h",
     "src/isolate.cc",
     "src/isolate.h",
+    "src/json-parser.cc",
     "src/json-parser.h",
+    "src/json-stringifier.cc",
     "src/json-stringifier.h",
     "src/keys.cc",
     "src/keys.h",
     "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",
@@ skipping 817 matching lines @@
   }
 
   if (!is_component_build) {
     sources += [ "$target_gen_dir/d8-js.cc" ]
   }
   if (v8_enable_i18n_support) {
     deps += [ "//third_party/icu" ]
   }
 }
 
-if ((current_toolchain == host_toolchain && v8_toolset_for_shell == "host") || (current_toolchain == v8_snapshot_toolchain && v8_toolset_for_shell == "host") || (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
+if ((current_toolchain == host_toolchain && v8_toolset_for_shell == "host") ||
+    (current_toolchain == v8_snapshot_toolchain &&
+     v8_toolset_for_shell == "host") ||
+    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
   executable("v8_shell") {
     sources = [
       "samples/shell.cc",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
     configs += [
       # Note: don't use :internal_config here because this target will get
       # the :external_config applied to it by virtue of depending on :v8, and
@@ skipping 68 matching lines @@
   sources = [
     "test/fuzzer/wasm-asmjs.cc",
   ]
 
   deps = [
     ":fuzzer_support",
   ]
 
   configs = [ ":internal_config" ]
 }