Browser Plugin: Implement Back, Forward, and Go.

content/browser/browser_plugin/browser_plugin_embedder.h

Index: content/browser/browser_plugin/browser_plugin_embedder.h
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.h b/content/browser/browser_plugin/browser_plugin_embedder.h
index 2a92f946c8b885ff3102bc8c9c97f422f31d5976..edf01df11d3296a08453242618a62c7eb33406dd 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.h
+++ b/content/browser/browser_plugin/browser_plugin_embedder.h
@@ -121,6 +121,9 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver,
                         const WebKit::WebInputEvent& event,
                         IPC::Message* reply_message);
   void PluginDestroyed(int instance_id);
+  void Back(int instance_id);
+  void Forward(int instance_id);
+  void Go(int instance_id, int relative_index);
 
   // Called when visiblity of web_contents changes, so the embedder will
   // show/hide its guest.