This CL adds functionality in the level controller to

receive a signal level to use initially, instead of the
default initial signal level.

The initial form of the CL
(https://codereview.webrtc.org/2254973003/) was reverted
due to down-stream  dependencies. These have been resolved,
but the CL needed to be revised according to the new scheme
for passing parameters to the audio processing module.
Therefore, please review this CL as if it is new.

TBR=aleloi@webrtc.org
BUG=webrtc:6386

Review-Url: https://codereview.webrtc.org/2337083002
Cr-Commit-Position: refs/heads/master@{#14579}

webrtc/modules/audio_processing/include/audio_processing.cc

@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2016 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 "webrtc/modules/audio_processing/include/audio_processing.h"
+
+namespace webrtc {
+
+Beamforming::Beamforming()
+    : enabled(false),
+      array_geometry(),
+      target_direction(
+          SphericalPointf(static_cast<float>(M_PI) / 2.f, 0.f, 1.f)) {}
+Beamforming::Beamforming(bool enabled, const std::vector<Point>& array_geometry)
+    : Beamforming(enabled,
+                  array_geometry,
+                  SphericalPointf(static_cast<float>(M_PI) / 2.f, 0.f, 1.f)) {}
+
+Beamforming::Beamforming(bool enabled,
+                         const std::vector<Point>& array_geometry,
+                         SphericalPointf target_direction)
+    : enabled(enabled),
+      array_geometry(array_geometry),
+      target_direction(target_direction) {}
+
+Beamforming::~Beamforming() {}
+
+int AudioProcessing::StartDebugRecordingForPlatformFile(
+    rtc::PlatformFile handle) {
+  return -1;
+}
+
+}  // namespace webrtc