Ensure media's buffered ranges always have a range that includes currentTime.

media/tools/seek_tester/seek_tester.cc

Index: media/tools/seek_tester/seek_tester.cc
diff --git a/media/tools/seek_tester/seek_tester.cc b/media/tools/seek_tester/seek_tester.cc
index f66095f2b977f317c08044c7369a81886e64efb0..dcc30f7a8f786573e71086e6604782dbf33deb6b 100644
--- a/media/tools/seek_tester/seek_tester.cc
+++ b/media/tools/seek_tester/seek_tester.cc
@@ -27,6 +27,8 @@ class DemuxerHostImpl : public media::DemuxerHost {
   // DataSourceHost implementation.
   virtual void SetTotalBytes(int64 total_bytes) OVERRIDE {}
   virtual void AddBufferedByteRange(int64 start, int64 end) OVERRIDE {}
+  virtual void AddBufferedTimeRange(base::TimeDelta start,
+                                    base::TimeDelta end) OVERRIDE {}
 
   // DemuxerHost implementation.
   virtual void SetDuration(base::TimeDelta duration) OVERRIDE {}