Add set_timestamp to cma's DecoderBufferBase

chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc

Index: chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
diff --git a/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc b/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
index 93421a5139c3184e7428bd57b0c5e116f739a8ca..ab3a25878511bdd89262f2f0397f45afddb4f886 100644
--- a/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
+++ b/chromecast/media/cma/ipc_streamer/decoder_buffer_base_marshaller.cc
@@ -26,6 +26,7 @@ class DecoderBufferFromMsg : public DecoderBufferBase {
   // DecoderBufferBase implementation.
   StreamId stream_id() const override;
   base::TimeDelta timestamp() const override;
+  void set_timestamp(const base::TimeDelta& timestamp) override;
   const uint8* data() const override;
   uint8* writable_data() const override;
   size_t data_size() const override;
@@ -114,6 +115,10 @@ base::TimeDelta DecoderBufferFromMsg::timestamp() const {
   return pts_;
 }
 
+void DecoderBufferFromMsg::set_timestamp(const base::TimeDelta& timestamp) {
+  pts_ = timestamp;
+}
+
 const uint8* DecoderBufferFromMsg::data() const {
   CHECK(msg_->IsSerializedMsgAvailable());
   return data_;