 +    DOMString message;
 +};
 diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
-index 4784dd7..fc31d7f 100644
+index deba6ab..fba68e8 100644
 --- a/third_party/WebKit/Source/core/frame/FrameView.cpp
 +++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
 @@ -40,6 +40,7 @@

 
             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 a41064e..f46e33d 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1287,6 +1287,8 @@ public:
         StarInTimingAllowOrigin = 1483,
         SVGSMILAdditiveAnimation = 1484,
 
+        DocumentCreateEventRequestedVisibilityEvent = 1500,
+

   bool displayed_insecure_content_;
 
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index 96a3043..3887d3c 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -1456,6 +1456,10 @@ IPC_MESSAGE_ROUTED0(FrameHostMsg_DispatchLoad)
 IPC_MESSAGE_ROUTED1(FrameHostMsg_RouteMessageEvent,
                     FrameMsg_PostMessage_Params)
 
