[Cronet] Provide shim from deprecated cronet_c_for_grpc API to bidirectional_stream_c API.

components/cronet/ios/cronet_c_for_grpc.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_CRONET_IOS_CRONET_C_FOR_GRPC_H_
+#define COMPONENTS_CRONET_IOS_CRONET_C_FOR_GRPC_H_
+
+#include "bidirectional_stream_c.h"
+
+// TODO(mef): Remove this header after transition to bidirectional_stream_c.h
+// See crbug.com/650462 for details.
+
+/* Define deprecated Cronet Engine API using current API. */
+#define cronet_engine stream_engine
+
+/* Define deprecated Bidirectional Stream  API using current API. */
+#define cronet_bidirectional_stream bidirectional_stream
+#define cronet_bidirectional_stream_header bidirectional_stream_header
+#define cronet_bidirectional_stream_header_array \
+  bidirectional_stream_header_array
+#define cronet_bidirectional_stream_callback bidirectional_stream_callback
+
+#define cronet_bidirectional_stream_create bidirectional_stream_create
+#define cronet_bidirectional_stream_destroy bidirectional_stream_destroy
+#define cronet_bidirectional_stream_disable_auto_flush \
+  bidirectional_stream_disable_auto_flush
+#define cronet_bidirectional_stream_delay_request_headers_until_flush \
+  bidirectional_stream_delay_request_headers_until_flush
+#define cronet_bidirectional_stream_start bidirectional_stream_start
+#define cronet_bidirectional_stream_read bidirectional_stream_read
+#define cronet_bidirectional_stream_write bidirectional_stream_write
+#define cronet_bidirectional_stream_flush bidirectional_stream_flush
+#define cronet_bidirectional_stream_cancel bidirectional_stream_cancel
+#define cronet_bidirectional_stream_is_done bidirectional_stream_is_done
+
+#endif  // COMPONENTS_CRONET_IOS_CRONET_C_FOR_GRPC_H_