Inline extensions API gyp into GN build.

chrome/common/extensions/api/schemas.gni

-# 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/features.gni")
-import("//build/config/ui.gni")
-
-assert(enable_extensions)
-
-gypi_values = exec_script("//build/gypi_to_gn.py",
-                          [ rebase_path("schemas.gypi") ],
-                          "scope",
-                          [ "schemas.gypi" ])
-
-# Common sources that are both bundled and compiled.
-schema_sources = gypi_values.main_schema_files
-if (enable_task_manager) {
-  schema_sources += gypi_values.task_manager_dependent_schema_files
-}
-if (is_chromeos) {
-  schema_sources += gypi_values.chromeos_schema_files
-} else if (is_linux || is_win) {
-  schema_sources += gypi_values.input_ime_schema_file
-}
-if (enable_service_discovery) {
-  schema_sources += gypi_values.service_discovery_schema_files
-}
-if (enable_webrtc) {
-  schema_sources += gypi_values.webrtc_schema_files
-}
-if (enable_app_list) {
-  schema_sources += gypi_values.app_list_schema_files
-}
-
-uncompiled_sources = gypi_values.main_non_compiled_schema_files
-if (is_chromeos) {
-  uncompiled_sources += gypi_values.chromeos_non_compiled_schema_files
-}
-
-uncompiled_bundle_schema_sources = gypi_values.non_compiled_bundle_schema_files
-if (!is_chromeos) {
-  uncompiled_bundle_schema_sources +=
-      gypi_values.non_chromeos_non_compiled_bundle_schema_files
-}
-
-root_namespace = "extensions::api::%(namespace)s"
-schema_include_rules = "extensions/common/api:extensions::api::%(namespace)s"
-schema_dependencies = [ "//extensions/common/api" ]