diff --git a/spdy/core/priority_write_scheduler.h b/spdy/core/priority_write_scheduler.h
index 20c9c13..bcacb25 100644
--- a/spdy/core/priority_write_scheduler.h
+++ b/spdy/core/priority_write_scheduler.h
@@ -265,7 +265,7 @@
   }
 
   // Returns true if a stream is ready.
-  bool IsStreamReady(StreamIdType stream_id) const {
+  bool IsStreamReady(StreamIdType stream_id) const override {
     auto it = stream_infos_.find(stream_id);
     if (it == stream_infos_.end()) {
       SPDY_DLOG(INFO) << "Stream " << stream_id << " not registered";
diff --git a/spdy/core/write_scheduler.h b/spdy/core/write_scheduler.h
index 07e5fb3..7906ad7 100644
--- a/spdy/core/write_scheduler.h
+++ b/spdy/core/write_scheduler.h
@@ -147,6 +147,9 @@
   // Returns the number of streams currently marked ready.
   virtual size_t NumReadyStreams() const = 0;
 
+  // Returns true if stream with |stream_id| is ready.
+  virtual bool IsStreamReady(StreamIdType stream_id) const = 0;
+
   // Returns summary of internal state, for logging/debugging.
   virtual SpdyString DebugString() const = 0;
 };