AGC2 as a new APM sub-module operating with hard-coded gain.

webrtc/modules/audio_processing/agc2/agc2_unittest.cc

Index: webrtc/modules/audio_processing/agc2/agc2_unittest.cc
diff --git a/webrtc/modules/audio_processing/agc2/agc2_unittest.cc b/webrtc/modules/audio_processing/agc2/agc2_unittest.cc
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+++ b/webrtc/modules/audio_processing/agc2/agc2_unittest.cc
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+/*
+ *  Copyright (c) 2017 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 <memory>
+
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/modules/audio_processing/agc2/agc2_impl.h"
+#include "webrtc/modules/audio_processing/agc2/agc2_mock.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace test {
+
+TEST(Agc2, Instance) {
+  rtc::CriticalSection crit_capture;
+  std::unique_ptr<Agc2> agc2;
+  agc2.reset(new Agc2Impl(&crit_capture));
+}
+
+}  // namespace test
+}  // namespace webrtc