 +    DOMString message;
 +};
 diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
-index 3fa8e63..8f2feb0 100644
+index 5c308d5..4c9d74a 100644
 --- a/third_party/WebKit/Source/core/frame/FrameView.cpp
 +++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
 @@ -40,6 +40,7 @@

 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Location.h"
@@ -2558,6 +2559,15 @@ void FrameView::updateLifecyclePhasesInternal(DocumentLifecycle::LifecycleState
             // This was required for slimming paint v1 but is only temporarily
             // needed for slimming paint v2.
             view.compositor()->updateIfNeededRecursive();

 
             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 fc6a5e8..62add1c 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1282,6 +1282,8 @@ public:
 
         PerformanceResourceTimingSizes = 1478,
 
+        DocumentCreateEventRequestedVisibilityEvent = 1500,
+
