  create mode 100644 third_party/WebKit/Source/core/events/RequestedVisibilityEventInit.idl
 
 diff --git a/third_party/WebKit/Source/core/core.gypi b/third_party/WebKit/Source/core/core.gypi
-index 5c41847..6529468 100644
+index 9221f7e..3e78957 100644
 --- a/third_party/WebKit/Source/core/core.gypi
 +++ b/third_party/WebKit/Source/core/core.gypi
 @@ -134,6 +134,7 @@

             'events/EventInit.idl',
             'events/EventListenerOptions.idl',
             'events/EventModifierInit.idl',
@@ -3881,6 +3886,8 @@
             '<(blink_core_output_dir)/events/DragEventInit.h',
             '<(blink_core_output_dir)/events/ErrorEventInit.cpp',
             '<(blink_core_output_dir)/events/ErrorEventInit.h',

 
             DCHECK(lifecycle().state() >= DocumentLifecycle::CompositingClean);
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/UseCounter.h
index 8c08ccf..9a1391d 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1288,6 +1288,9 @@ public:
         RadioNameMatchingASCIICaseless = 1514,
         RadioNameMatchingCaseFolding = 1515,
 
+        DocumentCreateEventRequestedVisibilityEvent = 1600,
+
