Support (E)AC3 passthrough

media/base/audio_splicer.cc

Index: media/base/audio_splicer.cc
diff --git a/media/base/audio_splicer.cc b/media/base/audio_splicer.cc
index 0976c89432a3baef1ce06606b295b7d840c2bb4d..88d7aeef185e91cfa422261135a5e14e2c51ab2c 100644
--- a/media/base/audio_splicer.cc
+++ b/media/base/audio_splicer.cc
@@ -183,7 +183,8 @@ bool AudioStreamSanitizer::AddInput(const scoped_refptr<AudioBuffer>& input) {
   if (!delta.is_zero())
     frames_to_fill = output_timestamp_helper_.GetFramesToTarget(timestamp);
 
-  if (frames_to_fill == 0 || std::abs(frames_to_fill) < kMinGapSize) {
+  if (frames_to_fill == 0 || std::abs(frames_to_fill) < kMinGapSize ||
+      input->sample_format() == kSampleFormatRaw) {
     AddOutputBuffer(input);
     return true;
   }