Add timelineOffset() support to WebMediaPlayerAndroid.

content/renderer/media/android/media_source_delegate.cc

Index: content/renderer/media/android/media_source_delegate.cc
diff --git a/content/renderer/media/android/media_source_delegate.cc b/content/renderer/media/android/media_source_delegate.cc
index 324ee80b47a1b2f74b8072c73b02e4833d602846..eb4f5c3dcf2779bc2435e996e975094eaa329835 100644
--- a/content/renderer/media/android/media_source_delegate.cc
+++ b/content/renderer/media/android/media_source_delegate.cc
@@ -114,6 +114,14 @@ bool MediaSourceDelegate::IsVideoEncrypted() {
   return is_video_encrypted_;
 }
 
+base::Time MediaSourceDelegate::GetTimelineOffset() const {
+  DCHECK(main_loop_->BelongsToCurrentThread());
+  if (!chunk_demuxer_)
+    return base::Time();
+
+  return chunk_demuxer_->GetTimelineOffset();
+}
+
 void MediaSourceDelegate::StopDemuxer() {
   DCHECK(media_loop_->BelongsToCurrentThread());
   DCHECK(chunk_demuxer_);