Add return-by-value implementations of blink::WebMediaPlayer::buffered()

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index 141d2cebfb0e46e53f63c2497fcaacc3e4dafec6..5605c2a8152903cd807c6c7d5b04af20075ba8cf 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -306,6 +306,11 @@ const blink::WebTimeRanges& WebMediaPlayerMS::buffered() {
   return buffered_;
 }
 
+blink::WebTimeRanges WebMediaPlayerMS::buffered() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return buffered_;
+}
+
 double WebMediaPlayerMS::maxTimeSeekable() const {
   DCHECK(thread_checker_.CalledOnValidThread());
   return 0.0;