Surface button for loading stale cache copy on net error page.

chrome/renderer/net/error_cache_load.h

-// Copyright 2014 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_RENDERER_NET_ERROR_CACHE_LOAD_H_
-#define CHROME_RENDERER_NET_ERROR_CACHE_LOAD_H_
-
-#include "base/basictypes.h"
-#include "content/public/renderer/render_frame_observer.h"
-#include "gin/wrappable.h"
-#include "url/gurl.h"
-
-// ErrorCacheLoad class:
-//
-// This class makes cache loading operations available to the
-// error page loaded by NetErrorHelper.  It is bound to the javascript
-// window.errorCacheLoad object.
-
-class GURL;
-
-namespace content {
-class RenderFrame;
-}
-
-class ErrorCacheLoad : public gin::Wrappable<ErrorCacheLoad>,
-                       public content::RenderFrameObserver {
- public:
-  static gin::WrapperInfo kWrapperInfo;
-
-  static void Install(content::RenderFrame* render_frame, const GURL& page_url);
-
- private:
-  ErrorCacheLoad(content::RenderFrame* render_frame, const GURL& page_url);
-  virtual ~ErrorCacheLoad();
-
-  // Loads the original URL associated with the frame, with the blink
-  // ReturnCacheDataDontLoad flag set to make sure that the value is
-  // only gotten from cache.
-  bool ReloadStaleInstance();
-
-  // gin::WrappableBase
-  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
-      v8::Isolate* isolate) OVERRIDE;
-
-  // RenderFrameObserver.  Overridden to avoid being destroyed when RenderFrame
-  // goes away; ErrorCacheLoad objects are owned by the JS garbage collector.
-  virtual void OnDestruct() OVERRIDE;
-
-  // We'll be torn down by V8 when the page goes away, so it's safe to hold
-  // a naked pointer to the render frame.
-  content::RenderFrame* render_frame_;
-
-  const GURL page_url_;
-
-  bool render_frame_destroyed_;
-
-  DISALLOW_COPY_AND_ASSIGN(ErrorCacheLoad);
-};
-
-#endif  // CHROME_RENDERER_NET_ERROR_CACHE_LOAD_H_