Browser Plugin: Update Guest WebContents Visibility on BrowserPlugin Visiblity Change.

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 2e2114cf4d20beea1be26e61f5e8cfb337f3b485..1973c55231bbe677ee6e59362f83dfb1091fffc6 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -187,6 +187,7 @@ class CONTENT_EXPORT BrowserPlugin :
   int process_id_;
   std::string storage_partition_id_;
   bool persist_storage_;
+  bool visible_;
   typedef std::vector<v8::Persistent<v8::Function> > EventListeners;
   typedef std::map<std::string, EventListeners> EventListenerMap;
   EventListenerMap event_listener_map_;