Reland 596ff54335b2a1b393af10657bc4945114f3beed - Split API bundle generation steps

extensions/common/api/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("//extensions/generated_extensions_api.gni")
+import("schemas.gni")
 
 # GYP version: extensions/common/api/api.gyp:extensions_api
 generated_extensions_api("api") {
-  sources = [
-    "app_runtime.idl",
-    "app_view_internal.json",
-    "cast_channel.idl",
-    "dns.idl",
-    "extensions_manifest_types.json",
-    "hid.idl",
-    "power.idl",
-    "runtime.json",
-    "serial.idl",
-    "socket.idl",
-    "sockets_tcp.idl",
-    "sockets_tcp_server.idl",
-    "sockets_udp.idl",
-    "storage.json",
-    "test.json",
-    "usb.idl",
-    "usb_private.idl",
-  ]
-  root_namespace = "extensions::core_api::%(namespace)s"
+  schemas = true
+  bundle = true
+}
+
+# GYP version: extensions/browser/api/api_registration.gyp:extensions_api_registration
+generated_extensions_api("api_registration") {
   impl_dir = "//extensions/browser/api"
-  bundle = true
+  bundle_registration = true
+
   deps = [
     "//device/serial",
     "//skia",
   ]
 }