<webview>: Move back, forward, canGoBack, canGoForward, go from content to chrome

chrome/browser/webview/webview_guest.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_WEBVIEW_WEBVIEW_GUEST_H_
 #define CHROME_BROWSER_WEBVIEW_WEBVIEW_GUEST_H_
 
 #include "base/observer_list.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "content/public/browser/web_contents_observer.h"
@@ skipping 20 matching lines @@
   static WebViewGuest* From(int embedder_process_id, int instance_id);
 
   content::WebContents* embedder_web_contents() const {
     return embedder_web_contents_;
   }
 
   content::WebContents* web_contents() const {
     return WebContentsObserver::web_contents();
   }
 
+  // If possible, navigate the guest to |relative_index| entries away from the
+  // current navigation entry.
+  void Go(int relative_index);
+
   int instance_id() const { return webview_instance_id_; }
 
   extensions::ScriptExecutor* script_executor() {
     return script_executor_.get();
   }
 
  private:
   virtual ~WebViewGuest();
 
   void DispatchEvent(const std::string& event_name,
@@ skipping 26 matching lines @@
   const int webview_instance_id_;
 
   ObserverList<extensions::TabHelper::ScriptExecutionObserver>
       script_observers_;
   scoped_ptr<extensions::ScriptExecutor> script_executor_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 #endif  // CHROME_BROWSER_WEBVIEW_WEBVIEW_GUEST_H_