| Index: content/common/browser_plugin_messages.h
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| diff --git a/content/common/browser_plugin_messages.h b/content/common/browser_plugin_messages.h
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| index 8d8a608a2754b54cb7e49e8137812095d655a573..6bc5154b13372c0566e61d2e4b36ac9d39d54971 100644
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| --- a/content/common/browser_plugin_messages.h
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| +++ b/content/common/browser_plugin_messages.h
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| @@ -117,6 +117,11 @@ IPC_MESSAGE_ROUTED3(BrowserPluginHostMsg_NavigateGuest,
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|  IPC_MESSAGE_ROUTED1(BrowserPluginHostMsg_PluginDestroyed,
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|                      int /* instance_id */)
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|  
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| +// Tells the guest it has been shown or hidden.
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| +IPC_MESSAGE_ROUTED2(BrowserPluginHostMsg_SetVisibility,
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| +                    int /* instance_id */,
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| +                    bool /* visible */)
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| +
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|  // -----------------------------------------------------------------------------
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|  // These messages are from the guest renderer to the browser process
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|  
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| 
 |