Reland 596ff54335b2a1b393af10657bc4945114f3beed - Split API bundle generation steps

extensions/browser/api/api_registration.gyp

+# 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.
+
+{
+  'targets': [
+    {
+      # GN version: //extensions/browser/api
+      'target_name': 'extensions_api_registration',
+      'type': 'static_library',
+      # TODO(jschuh): http://crbug.com/167187 size_t -> int
+      'msvs_disabled_warnings': [ 4267 ],
+      'includes': [
+        '../../../build/json_schema_bundle_registration_compile.gypi',
+        '../../common/api/schemas.gypi',
+      ],
+      'dependencies': [
+        '<(DEPTH)/extensions/common/api/api.gyp:extensions_api',
+      ],
+      'conditions': [
+        ['enable_extensions==1', {
+          'dependencies': [
+            '<(DEPTH)/device/serial/serial.gyp:device_serial_mojo',
+            '<(DEPTH)/skia/skia.gyp:skia',
+          ],
+        }],
+      ],
+    },
+  ],
+}