Chromecast: Add stream id interface in DecoderBufferBase class

chromecast/media/cma/base/decoder_buffer_adapter.cc

Index: chromecast/media/cma/base/decoder_buffer_adapter.cc
diff --git a/chromecast/media/cma/base/decoder_buffer_adapter.cc b/chromecast/media/cma/base/decoder_buffer_adapter.cc
index 45095da169b3cb9bcb0f9d77f6eefc3e389d13f4..07bc543ff8e4009bb8a28f474a9e5b586deebe76 100644
--- a/chromecast/media/cma/base/decoder_buffer_adapter.cc
+++ b/chromecast/media/cma/base/decoder_buffer_adapter.cc
@@ -10,13 +10,23 @@ namespace chromecast {
 namespace media {
 
 DecoderBufferAdapter::DecoderBufferAdapter(
-    const scoped_refptr< ::media::DecoderBuffer>& buffer)
-    : buffer_(buffer) {
+    const scoped_refptr<::media::DecoderBuffer>& buffer)
+    : DecoderBufferAdapter(kPrimary, buffer) {
+}
+
+DecoderBufferAdapter::DecoderBufferAdapter(
+    StreamId stream_id, const scoped_refptr<::media::DecoderBuffer>& buffer)
+    : stream_id_(stream_id),
+      buffer_(buffer) {
 }
 
 DecoderBufferAdapter::~DecoderBufferAdapter() {
 }
 
+StreamId DecoderBufferAdapter::stream_id() const {
+  return stream_id_;
+}
+
 base::TimeDelta DecoderBufferAdapter::timestamp() const {
   return buffer_->timestamp();
 }