Adding AudioDeviceDataObserver interface

webrtc/modules/audio_device/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../../webrtc.gni")
 
@@ skipping 75 matching lines @@
   if (is_win) {
     include_dirs += [ "win" ]
   }
   if (is_android) {
     include_dirs += [ "android" ]
   }
   defines = []
   cflags = []
   if (rtc_include_internal_audio_device) {
     sources += [
+      "audio_device_data_observer.cc",
       "audio_device_impl.cc",
       "audio_device_impl.h",
+      "include/audio_device_data_observer.h",
     ]
     if (is_android) {
       sources += [
         "android/audio_device_template.h",
         "android/audio_manager.cc",
         "android/audio_manager.h",
         "android/audio_record_jni.cc",
         "android/audio_record_jni.h",
         "android/audio_track_jni.cc",
         "android/audio_track_jni.h",
@@ skipping 238 matching lines @@
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioRecord.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java",
     ]
     deps = [
       "//webrtc/base:base_java",
     ]
   }
 }