[Chromecast] Fade in after a mixer input stream has skipped

chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc

Index: chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc
diff --git a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc
index 1e7cc895cc43fcefb9ff7106d9cf1178d2614106..96a3cde3ee0a7a64c0e02560eecc5bc8722522b9 100644
--- a/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc
+++ b/chromecast/media/cma/backend/alsa/stream_mixer_alsa_input_impl.cc
@@ -235,6 +235,14 @@ void StreamMixerAlsaInputImpl::DidQueueData(bool end_of_stream) {
   mixer_->OnFramesQueued();
 }
 
+void StreamMixerAlsaInputImpl::OnSkipped() {
+  DCHECK(mixer_task_runner_->BelongsToCurrentThread());
+  if (state_ == kStateNormalPlayback) {
+    // Fade in once this input starts providing data again.
+    fade_frames_remaining_ = NormalFadeFrames();
+  }
+}
+
 void StreamMixerAlsaInputImpl::AfterWriteFrames(
     const MediaPipelineBackendAlsa::RenderingDelay& mixer_rendering_delay) {
   DCHECK(mixer_task_runner_->BelongsToCurrentThread());