Simplify AudioSplicer logic which slots buffers before or after a splice point.

media/filters/audio_renderer_impl.cc

Index: media/filters/audio_renderer_impl.cc
diff --git a/media/filters/audio_renderer_impl.cc b/media/filters/audio_renderer_impl.cc
index bb279e9156e1ddbd6ffeb753f816582442e6ec73..dd885279af897c0b7520e11aad082bd444ab7b9a 100644
--- a/media/filters/audio_renderer_impl.cc
+++ b/media/filters/audio_renderer_impl.cc
@@ -757,6 +757,11 @@ void AudioRendererImpl::OnConfigChange() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(expecting_config_changes_);
   buffer_converter_->ResetTimestampState();
+  // Drain flushed buffers from the converter so the AudioSplicer receives all
+  // data ahead of any OnNewSpliceBuffer() calls.  Since discontinuities should
+  // only appear after config changes, AddInput() should never fail here.
+  while (buffer_converter_->HasNextBuffer())
+    CHECK(splicer_->AddInput(buffer_converter_->GetNextBuffer()));
 }
 
 }  // namespace media