Let AutoplayUmaHelper listen to visibilitychange instead of unload

third_party/WebKit/Source/core/html/AutoplayUmaHelper.h

Index: third_party/WebKit/Source/core/html/AutoplayUmaHelper.h
diff --git a/third_party/WebKit/Source/core/html/AutoplayUmaHelper.h b/third_party/WebKit/Source/core/html/AutoplayUmaHelper.h
index 7dda64bb56d55bc2b799c5290a8a9b9f2c420e88..a331dade004db7e4f514fdc484c28f1c46492381 100644
--- a/third_party/WebKit/Source/core/html/AutoplayUmaHelper.h
+++ b/third_party/WebKit/Source/core/html/AutoplayUmaHelper.h
@@ -67,9 +67,9 @@ class AutoplayUmaHelper final : public EventListener {
 
   void handlePlayingEvent();
   void handlePauseEvent();
-  void handleUnloadEvent();
+  void handlePageVisibilityChangeEvent();
 
-  void maybeUnregisterUnloadListener();
+  void maybeUnregisterPageVisibilityChangeListener();
 
   void maybeStartRecordingMutedVideoPlayMethodBecomeVisible();
   void maybeStopRecordingMutedVideoPlayMethodBecomeVisible(bool isVisible);
@@ -80,7 +80,7 @@ class AutoplayUmaHelper final : public EventListener {
   void onVisibilityChangedForMutedVideoOffscreenDuration(bool isVisibile);
   void onVisibilityChangedForMutedVideoPlayMethodBecomeVisible(bool isVisible);
 
-  bool shouldListenToUnloadEvent() const;
+  bool shouldListenToPageVisibilityChangeEvent() const;
 
   // The autoplay source. Use AutoplaySource::NumberOfSources for invalid
   // source.