Make V8 extras a separate type of native

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")
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
@@ skipping 278 matching lines @@
 
   if (v8_use_external_startup_data) {
     outputs += [ "$target_gen_dir/libraries_experimental.bin" ]
     args += [
       "--startup_blob",
       rebase_path("$target_gen_dir/libraries_experimental.bin", root_build_dir),
     ]
   }
 }
 
+action("js2c_extras") {
+  visibility = [ ":*" ]  # Only targets in this file can depend on this.
+
+  script = "tools/js2c.py"
+
+  # The script depends on this other script, this rule causes a rebuild if it
+  # changes.
+  inputs = [ "tools/jsmin.py" ]
+
+  sources = v8_extra_library_files
+
+  outputs = [
+    "$target_gen_dir/extras-libraries.cc",
+  ]
+
+  args = [
+           rebase_path("$target_gen_dir/extras-libraries.cc",
+                       root_build_dir),
+           "EXTRAS",
+         ] + rebase_path(sources, root_build_dir)
+
+  if (v8_use_external_startup_data) {
+    outputs += [ "$target_gen_dir/libraries_extras.bin" ]
+    args += [
+      "--startup_blob",
+      rebase_path("$target_gen_dir/libraries_extras.bin", root_build_dir),
+    ]
+  }
+}
+
 action("d8_js2c") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   script = "tools/js2c.py"
 
   inputs = [
     "src/d8.js",
     "src/macros.py",
   ]
 
   outputs = [
     "$target_gen_dir/d8-js.cc",
   ]
 
   args = rebase_path(outputs, root_build_dir) + [ "D8" ] +
          rebase_path(inputs, root_build_dir)
 }
 
 if (v8_use_external_startup_data) {
   action("natives_blob") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
     deps = [
       ":js2c",
       ":js2c_experimental",
+      ":js2c_extras",
     ]
 
     sources = [
       "$target_gen_dir/libraries.bin",
       "$target_gen_dir/libraries_experimental.bin",
+      "$target_gen_dir/libraries_extras.bin",
     ]
 
     outputs = [
       "$root_out_dir/natives_blob.bin",
     ]
 
     script = "tools/concatenate-files.py"
 
     args = rebase_path(sources + outputs, root_build_dir)
   }
@@ skipping 64 matching lines @@
 ###############################################################################
 # Source Sets (aka static libraries)
 #
 
 source_set("v8_nosnapshot") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   deps = [
     ":js2c",
     ":js2c_experimental",
+    ":js2c_extras",
     ":v8_base",
   ]
 
   sources = [
     "$target_gen_dir/libraries.cc",
     "$target_gen_dir/experimental-libraries.cc",
+    "$target_gen_dir/extras-libraries.cc",
     "src/snapshot/snapshot-empty.cc",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":features",
     ":toolchain",
   ]
 }
 
 source_set("v8_snapshot") {
   # Only targets in this file and the top-level visibility target can
   # depend on this.
   visibility = [
     ":*",
     "//:gn_visibility",
   ]
 
   deps = [
     ":js2c",
     ":js2c_experimental",
+    ":js2c_extras",
     ":run_mksnapshot",
     ":v8_base",
   ]
 
   sources = [
     "$target_gen_dir/libraries.cc",
     "$target_gen_dir/experimental-libraries.cc",
+    "$target_gen_dir/extras-libraries.cc",
     "$target_gen_dir/snapshot.cc",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":features",
     ":toolchain",
   ]
 }
 
 if (v8_use_external_startup_data) {
   source_set("v8_external_snapshot") {
     visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
     deps = [
       ":js2c",
       ":js2c_experimental",
+      ":js2c_extras",
       ":run_mksnapshot",
       ":v8_base",
       ":natives_blob",
     ]
 
     sources = [
       "src/snapshot/natives-external.cc",
       "src/snapshot/snapshot-external.cc",
     ]
 
@@ skipping 1144 matching lines @@
       sources += [
         "src/d8-debug.cc",
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }