Re-add sourceSetTimestampOffset to webmediaplayer_impl

webkit/media/webmediaplayer_impl.cc

Index: webkit/media/webmediaplayer_impl.cc
diff --git a/webkit/media/webmediaplayer_impl.cc b/webkit/media/webmediaplayer_impl.cc
index 7fef4e01174e533eb7c320bb91f4b87d139bb1c6..a29732540f82c0ac7f3ce6b327a7ca859fda045f 100644
--- a/webkit/media/webmediaplayer_impl.cc
+++ b/webkit/media/webmediaplayer_impl.cc
@@ -682,6 +682,11 @@ void WebMediaPlayerImpl::sourceEndOfStream(
     GetClient()->durationChanged();
 }
 
+bool WebMediaPlayerImpl::sourceSetTimestampOffset(const WebKit::WebString& id,
+                                                  double offset) {
+  return proxy_->DemuxerSetTimestampOffset(id.utf8().data(), offset);
+}
+
 WebKit::WebMediaPlayer::MediaKeyException
 WebMediaPlayerImpl::generateKeyRequest(const WebString& key_system,
                                        const unsigned char* init_data,