Notifying the Out of Process Renderer about Visibility Change of a Remote Frame

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index c67cd766bfa3a81354b071f6c96d5571c87d0fe7..00dbff256974fdad8af9ddbf0efc59e2627abbb9 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -1079,6 +1079,10 @@ IPC_MESSAGE_ROUTED1(FrameHostMsg_ForwardInputEvent,
 // position of a child's ancestor has changed).
 IPC_MESSAGE_ROUTED1(FrameHostMsg_FrameRectChanged, gfx::Rect /* frame_rect */)
 
+// Informs the child that the frame has changed visibility. This message will
+// be then forwarded to the guest WebContents.
+IPC_MESSAGE_ROUTED1(FrameHostMsg_VisibilityChanged, bool /* visible */)
+
 // Used to tell the parent that the user right clicked on an area of the
 // content area, and a context menu should be shown for it. The params
 // object contains information about the node(s) that were selected when the