Moved audioproc_f interface into api directory.

The interface of the audioproc_f tool should be located in the api/ directory, so it becomes visible to the outside world.

Bug: webrtc:8732
Change-Id: Ia7475883aeb0e1f7a6afa5e791204b38dc53a8b8
Reviewed-on: https://webrtc-review.googlesource.com/61801
Commit-Queue: Ivo Creusen <ivoc@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22449}
diff --git a/api/test/audioproc_float.cc b/api/test/audioproc_float.cc
new file mode 100644
index 0000000..9d3ad7e
--- /dev/null
+++ b/api/test/audioproc_float.cc
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/test/audioproc_float.h"
+
+#include <utility>
+
+#include "modules/audio_processing/test/audioproc_float_impl.h"
+
+namespace webrtc {
+namespace test {
+
+int AudioprocFloat(std::unique_ptr<AudioProcessingBuilder> ap_builder,
+                   int argc,
+                   char* argv[]) {
+  return AudioprocFloatImpl(std::move(ap_builder), argc, argv);
+}
+
+}  // namespace test
+}  // namespace webrtc