Add plumbing and support for crossfading StreamParserBuffers.

media/base/stream_parser_buffer.cc

Index: media/base/stream_parser_buffer.cc
diff --git a/media/base/stream_parser_buffer.cc b/media/base/stream_parser_buffer.cc
index bb46ef516eccd1dc3e25e1c1d09447a284a6cfc6..47776889c1febc265be1377f76c42473fc06f19c 100644
--- a/media/base/stream_parser_buffer.cc
+++ b/media/base/stream_parser_buffer.cc
@@ -63,4 +63,14 @@ void StreamParserBuffer::SetConfigId(int config_id) {
   config_id_ = config_id;
 }
 
+const std::vector<scoped_refptr<StreamParserBuffer> >&
+StreamParserBuffer::GetFadeOutPreroll() const {
+  return fade_out_preroll_;
+}
+
+void StreamParserBuffer::SetFadeOutPreroll(
+    const std::vector<scoped_refptr<StreamParserBuffer> >& fade_out_preroll) {
+  fade_out_preroll_ = fade_out_preroll;

[acolwell GONE FROM CHROMIUM, 2014/01/15 19:28:50]

nit: It might be worth adding a DCHECK(HasNoFadeOutPreroll(fade_out_preroll));
to make sure that  none of the preroll buffers have preroll buffers since we
have no logic to handle recursive nesting of these guys.

[DaleCurtis, 2014/01/15 22:40:56]

Done.

+}
+
 }  // namespace media