Graceful handling of extension process crashes

chrome/browser/extensions/extension_host.h

 // Copyright (c) 2006-2009 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_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 31 matching lines @@
 
   // Create an ExtensionView and tie it to this host and |browser|.
   void CreateView(Browser* browser);
 
   Extension* extension() { return extension_; }
   RenderViewHost* render_view_host() const { return render_view_host_; }
   RenderProcessHost* render_process_host() const;
   SiteInstance* site_instance() const;
   bool did_stop_loading() const { return did_stop_loading_; }
 
+  // Returns true if the render view is initialized and didn't crash.
+  bool IsRenderViewLive() const;
+
   // Initializes our RenderViewHost by creating its RenderView and navigating
   // to this host's url.  Uses host_view for the RenderViewHost's view (can be
   // NULL).
   void CreateRenderView(RenderWidgetHostView* host_view);
 
+  // Restarts extension's renderer process. Can be called only if the renderer
+  // process crashed.
+  void RecoverCrashedExtension();
+
   // RenderViewHostDelegate
   virtual const GURL& GetURL() const { return url_; }
+  virtual void RenderViewGone(RenderViewHost* render_view_host);
   virtual WebPreferences GetWebkitPrefs();
   virtual void RunJavaScriptMessage(
       const std::wstring& message,
       const std::wstring& default_prompt,
       const GURL& frame_url,
       const int flags,
       IPC::Message* reply_msg,
       bool* did_suppress_message);
   virtual void DidStopLoading(RenderViewHost* render_view_host);
   virtual RenderViewHostDelegate::View* GetViewDelegate() const;
@@ skipping 48 matching lines @@
   // Whether the RenderWidget has reported that it has stopped loading.
   bool did_stop_loading_;
 
   // The URL being hosted.
   GURL url_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_