Move key frame flag from StreamParserBuffer to DecoderBuffer

media/base/fake_text_track_stream.cc

Index: media/base/fake_text_track_stream.cc
diff --git a/media/base/fake_text_track_stream.cc b/media/base/fake_text_track_stream.cc
index f18e5403b4e3c2ebbf19ea1f2078657f6b8935f8..13a15052b382761705a638ca6aa4a8ab233fc7bc 100644
--- a/media/base/fake_text_track_stream.cc
+++ b/media/base/fake_text_track_stream.cc
@@ -62,7 +62,9 @@ void FakeTextTrackStream::SatisfyPendingRead(
   const int sd_len = static_cast<int>(side_data.size());
 
   scoped_refptr<DecoderBuffer> buffer;
-  buffer = DecoderBuffer::CopyFrom(data_buf, data_len, sd_buf, sd_len);
+
+  // Assume all fake text buffers are keyframes.
+  buffer = DecoderBuffer::CopyFrom(data_buf, data_len, sd_buf, sd_len, true);
 
   buffer->set_timestamp(start);
   buffer->set_duration(duration);