Add support for Chromium GN build

Build test

Add Fuzzer group

Add libfuzzer
diff --git a/.gn b/.gn
new file mode 100644
index 0000000..ee4734f
--- /dev/null
+++ b/.gn
@@ -0,0 +1,20 @@
+# Copyright 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+buildconfig = "//build/config/BUILDCONFIG.gn"
+secondary_source = "//build/secondary/"
+
+default_args = {
+  use_custom_libcxx = false
+}