Use AudioDeviceDescription::IsLoopbackDevice.

Replace duplicate implementation of AudioDeviceDescription::IsLoopbackDevice with function call.

Bug: 783109
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I896038026359723d8fe1c4366cd3a54ddd51e9c1
Reviewed-on: https://chromium-review.googlesource.com/897534Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534001}

content/browser/renderer_host/media/audio_input_delegate_impl.cc

@@ -219,9 +219,7 @@ AudioInputDelegateImpl::AudioInputDelegateImpl(
     // Only count for captures from desktop media picker dialog and system loop
     // back audio.
     if (device->type == MEDIA_DESKTOP_AUDIO_CAPTURE &&
-        (device_id == media::AudioDeviceDescription::kLoopbackInputDeviceId ||
-         device_id ==
-             media::AudioDeviceDescription::kLoopbackWithMuteDeviceId)) {
+        (media::AudioDeviceDescription::IsLoopbackDevice(device_id))) {
       IncrementDesktopCaptureCounter(SYSTEM_LOOPBACK_AUDIO_CAPTURER_CREATED);
     }
   }

media/audio/cras/cras_input.cc

@@ -27,9 +27,7 @@ CrasInputStream::CrasInputStream(const AudioParameters& params,
       stream_id_(0),
       stream_direction_(CRAS_STREAM_INPUT),
       pin_device_(NO_DEVICE),
-      is_loopback_(
-          device_id == AudioDeviceDescription::kLoopbackInputDeviceId ||
-          device_id == AudioDeviceDescription::kLoopbackWithMuteDeviceId),
+      is_loopback_(AudioDeviceDescription::IsLoopbackDevice(device_id)),
       mute_system_audio_(device_id ==
                          AudioDeviceDescription::kLoopbackWithMuteDeviceId),
       mute_done_(false) {

media/audio/win/audio_low_latency_input_win.cc

@@ -763,8 +763,7 @@ HRESULT WASAPIAudioInputStream::InitializeAudioEngine() {
   // Use event-driven mode only fo regular input devices. For loopback the
   // EVENTCALLBACK flag is specified when intializing
   // |audio_render_client_for_loopback_|.
-  if (device_id_ == AudioDeviceDescription::kLoopbackInputDeviceId ||
-      device_id_ == AudioDeviceDescription::kLoopbackWithMuteDeviceId) {
+  if (AudioDeviceDescription::IsLoopbackDevice(device_id_)) {
     flags = AUDCLNT_STREAMFLAGS_LOOPBACK | AUDCLNT_STREAMFLAGS_NOPERSIST;
   } else {
     flags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK | AUDCLNT_STREAMFLAGS_NOPERSIST;
@@ -845,8 +844,7 @@ HRESULT WASAPIAudioInputStream::InitializeAudioEngine() {
   //   samples from the capture endpoint buffer.
   //
   // http://msdn.microsoft.com/en-us/library/windows/desktop/dd316551(v=vs.85).aspx
-  if (device_id_ == AudioDeviceDescription::kLoopbackInputDeviceId ||
-      device_id_ == AudioDeviceDescription::kLoopbackWithMuteDeviceId) {
+  if (AudioDeviceDescription::IsLoopbackDevice(device_id_)) {
     hr = endpoint_device_->Activate(
         __uuidof(IAudioClient), CLSCTX_INPROC_SERVER, NULL,
         &audio_render_client_for_loopback_);