Add GN configuration (issue #1403)

libcef/common/extensions/api/BUILD.gn

@@ -0,0 +1,27 @@
+# Copyright 2016 The Chromium Embedded Framework Authors. Portions 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/json_schema_api.gni")
+import("schemas.gni")
+
+json_schema_api("api") {
+  schemas = true
+  bundle = true
+  configs = [ "//build/config:precompiled_headers" ]
+  bundle_name = "Chrome"
+
+  deps = schema_dependencies
+}
+
+json_schema_api("api_registration") {
+  impl_dir = "//cef/libcef/browser/extensions/api"
+  bundle_registration = true
+  configs = [ "//build/config:precompiled_headers" ]
+  bundle_name = "Chrome"
+
+  deps = [
+    ":api",
+  ]
+  deps += schema_dependencies
+}