Moving gRPC support interfaces out of cronet and into a new component.

components/cronet/ios/test/get_stream_engine.mm

Index: components/cronet/ios/test/get_stream_engine.mm
diff --git a/components/cronet/ios/test/get_stream_engine.mm b/components/cronet/ios/test/get_stream_engine.mm
new file mode 100644
index 0000000000000000000000000000000000000000..e82ac79c3b37df0f6f5ea67901b37547f08a6f96
--- /dev/null
+++ b/components/cronet/ios/test/get_stream_engine.mm
@@ -0,0 +1,18 @@
+// Copyright 2016 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 <Cronet/Cronet.h>
+#import <Foundation/Foundation.h>
+
+#include "components/cronet/ios/test/start_cronet.h"
+#include "components/grpc_support/test/get_stream_engine.h"
+
+namespace grpc_support {
+
+stream_engine* GetTestStreamEngine() {
+  cronet::StartCronetIfNecessary();
+  return [Cronet getGlobalEngine];
+}
+
+}  // namespace grpc_support