[TO 56] Fix race in media Pipeline::GetMediaTime() after seeking.

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 97d811948a65b9d3435fa587c3fdfd115b1cf5f2..e23d56285691aab0901012d071ee8fec7079914b 100644
--- a/media/base/pipeline_impl.h
+++ b/media/base/pipeline_impl.h
@@ -174,6 +174,11 @@ class MEDIA_EXPORT PipelineImpl : public Pipeline {
   // reported to JavaScript from going backwards in time.
   mutable base::TimeDelta last_media_time_;
 
+  // Set by Seek(), used in place of asking the renderer for current media time
+  // while a seek is pending. Renderer's time cannot be trusted until the seek
+  // has completed.
+  base::TimeDelta seek_time_;
+
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<PipelineImpl> weak_factory_;