[cronet] Add mechanism for restarting CronetEnvironment

components/grpc_support/test/get_stream_engine.h

 // 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.
 
 #ifndef COMPONENTS_GRPC_SUPPORT_TEST_GET_REQUEST_CONTEXT_GETTER_H_
 #define COMPONENTS_GRPC_SUPPORT_TEST_GET_REQUEST_CONTEXT_GETTER_H_
 
 struct stream_engine;
 
 namespace grpc_support {
 
 // Returns a stream_engine* for testing with the QuicTestServer.
 // The engine returned should resolve kTestServerHost as localhost:|port|,
 // and should have kTestServerHost configured as a QUIC server.
 stream_engine* GetTestStreamEngine(int port);
 
+// Starts the stream_engine* for testing with the QuicTestServer.
+// Has the same properties as GetTestStreamEngine.  This function is
+// used when the stream_engine* needs to be shut down and restarted
+// between test cases (including between all of the bidirectional

[mef, 2017/04/27 14:58:20]

nit: missing )

[lilyhoughton, 2017/05/01 15:31:35]

Done.

+// stream test cases and all other tests for the engine; this is the
+// situation for Cronet.
+void StartTestStreamEngine(int port);
+
+// Shuts a stream_engine* started with |StartTestStreamEngine| down.
+// See comment above.
+void ShutdownTestStreamEngine();
+
 }  // namespace grpc_support
 
 #endif  // COMPONENTS_GRPC_SUPPORT_TEST_GET_REQUEST_CONTEXT_GETTER_H_