Interpolate media time for mojo rendering pipeline.

media/base/pipeline_impl.h

Index: media/base/pipeline_impl.h
diff --git a/media/base/pipeline_impl.h b/media/base/pipeline_impl.h
index 307d06cd08247eb6853d05a0f1b5b313a21dab9a..97d811948a65b9d3435fa587c3fdfd115b1cf5f2 100644
--- a/media/base/pipeline_impl.h
+++ b/media/base/pipeline_impl.h
@@ -170,6 +170,10 @@ class MEDIA_EXPORT PipelineImpl : public Pipeline {
   // Current duration as reported by Demuxer.
   base::TimeDelta duration_;
 
+  // Set by GetMediaTime(), used to prevent the current media time value as
+  // reported to JavaScript from going backwards in time.
+  mutable base::TimeDelta last_media_time_;
+
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<PipelineImpl> weak_factory_;