[Chromoting] Add AudioVolumeApplier to reduce the complexity and the dependency of kChannels

remoting/host/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/util/process_version.gni")
 import("//media/media_options.gni")
 import("//remoting/build/config/remoting_build.gni")
 
 group("all_tests") {
   testonly = true
@@ skipping 46 matching lines @@
   sources = [
     "audio_capturer.cc",
     "audio_capturer.h",
     "audio_capturer_linux.cc",
     "audio_capturer_linux.h",
     "audio_capturer_mac.cc",
     "audio_capturer_win.cc",
     "audio_capturer_win.h",
     "audio_silence_detector.cc",
     "audio_silence_detector.h",
+    "audio_volume_applier.cc",
+    "audio_volume_applier.h",
     "backoff_timer.cc",
     "backoff_timer.h",
     "basic_desktop_environment.cc",
     "basic_desktop_environment.h",
     "branding.cc",
     "branding.h",
     "chromeos/aura_desktop_capturer.cc",
     "chromeos/aura_desktop_capturer.h",
     "chromeos/clipboard_aura.cc",
     "chromeos/clipboard_aura.h",
@@ skipping 394 matching lines @@
     ]
   }
 }
 
 # The host portions of the remoting unit tests.
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "audio_silence_detector_unittest.cc",
+    "audio_volume_applier_unittest.cc",
     "backoff_timer_unittest.cc",
     "chromeos/aura_desktop_capturer_unittest.cc",
     "chromeos/clipboard_aura_unittest.cc",
     "chromoting_host_context_unittest.cc",
     "chromoting_host_unittest.cc",
     "client_session_unittest.cc",
     "config_file_watcher_unittest.cc",
     "daemon_process_unittest.cc",
     "desktop_process_unittest.cc",
     "gcd_rest_client_unittest.cc",
@@ skipping 342 matching lines @@
     group("remoting_me2me_host_archive") {
       deps = [
         "//remoting/host/installer/mac:remoting_me2me_host_archive",
       ]
     }
   } else {
     group("remoting_me2me_host_archive") {
     }
   }
 }