[infra] Translate _sources.gypi files to _sources.gni files

runtime/lib/typed_data_sources.gni

Index: runtime/lib/typed_data_sources.gni
diff --git a/runtime/lib/typed_data_sources.gypi b/runtime/lib/typed_data_sources.gni
similarity index 55%
rename from runtime/lib/typed_data_sources.gypi
rename to runtime/lib/typed_data_sources.gni
index d68daed967d53807c48af2af9a5e973311cb96f7..4fdebb62366f86a09da57c50dfecacfeda9a6852 100644
--- a/runtime/lib/typed_data_sources.gypi
+++ b/runtime/lib/typed_data_sources.gni
@@ -1,13 +1,10 @@
-# Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+# Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Sources visible via dart:typed_data library.
-
-{
-  'sources': [
-    'typed_data.cc',
-    'typed_data_patch.dart',
-    'simd128.cc',
-  ],
-}
+typed_data_runtime_sources = [
+  "typed_data.cc",
+  "typed_data_patch.dart",
+  "simd128.cc",
+]