Extracted shell_interfaces and shell_public into a separate gyp file.

services/shell/shell_public.gyp

+# Copyright 2016 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.
+
+{
+  'targets': [
+  {
+    'target_name': 'shell_interfaces',
+    'type': 'none',
+    'variables': {
+      'mojom_files': [
+        '../catalog/public/interfaces/catalog.mojom',
+        'public/interfaces/capabilities.mojom',
+        'public/interfaces/connector.mojom',
+        'public/interfaces/interface_provider.mojom',
+        'public/interfaces/shell.mojom',
+        'public/interfaces/shell_client.mojom',
+        'public/interfaces/shell_client_factory.mojom',
+        'public/interfaces/shell_resolver.mojom',
+      ],
+      'mojom_typemaps': [
+        '<(DEPTH)/mojo/common/common_custom_types.typemap',
+      ],
+    },
+    'includes': [ '../../mojo/mojom_bindings_generator_explicit.gypi' ],
+    'dependencies': [
+      '<(DEPTH)/mojo/mojo_base.gyp:mojo_common_custom_types_mojom',
+    ],
+    'export_dependent_settings': [
+      '<(DEPTH)/mojo/mojo_base.gyp:mojo_common_custom_types_mojom',
+    ],
+  },
+  {
+    # GN version: //services/shell/public/cpp
+    'target_name': 'shell_public',
+    'type': 'static_library',
+    'sources': [
+      'public/cpp/application_runner.h',
+      'public/cpp/capabilities.h',
+      'public/cpp/connect.h',
+      'public/cpp/connection.h',
+      'public/cpp/connector.h',
+      'public/cpp/identity.h',
+      'public/cpp/initialize_base_and_icu.cc',
+      'public/cpp/initialize_base_and_icu.h',
+      'public/cpp/interface_binder.h',
+      'public/cpp/interface_factory.h',
+      'public/cpp/interface_factory_impl.h',
+      'public/cpp/interface_registry.h',
+      'public/cpp/lib/application_runner.cc',
+      'public/cpp/lib/capabilities.cc',
+      'public/cpp/lib/connection_impl.cc',
+      'public/cpp/lib/connection_impl.h',
+      'public/cpp/lib/connector_impl.cc',
+      'public/cpp/lib/connector_impl.h',
+      'public/cpp/lib/identity.cc',
+      'public/cpp/lib/interface_factory_binder.h',
+      'public/cpp/lib/interface_registry.cc',
+      'public/cpp/lib/names.cc',
+      'public/cpp/lib/shell_client.cc',
+      'public/cpp/lib/shell_connection.cc',
+      'public/cpp/lib/shell_connection_ref.cc',
+      'public/cpp/names.h',
+      'public/cpp/shell_client.h',
+      'public/cpp/shell_connection.h',
+      'public/cpp/shell_connection_ref.h',
+    ],
+    'dependencies': [
+      'shell_interfaces',
+      '<(DEPTH)/base/base.gyp:base_i18n',
+      '<(DEPTH)/mojo/mojo_public.gyp:mojo_cpp_bindings',
+    ],
+  },
+  ],
+}