Add support for Fuchsia
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2152273002

[mtklein edit from here down]
No public API changes.
TBR=reed@google.com

Review-Url: https://codereview.chromium.org/2152273002
diff --git a/third_party/third_party.gni b/third_party/third_party.gni
new file mode 100644
index 0000000..813ee38
--- /dev/null
+++ b/third_party/third_party.gni
@@ -0,0 +1,15 @@
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+declare_args() {
+}
+
+# Chrome's GN environment sets up a bunch of default configs we don't need/want here.
+unwanted_configs = [
+  "//build/config/clang:extra_warnings",
+  "//build/config/clang:find_bad_constructs",
+  "//build/config/compiler:chromium_code",
+  "//build/config:feature_flags",
+]