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

chrome/renderer/net/net_error_page_controller.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_NET_ERROR_PAGE_CONTROLLER_H_
+#define CHROME_RENDERER_NET_NET_ERROR_PAGE_CONTROLLER_H_
+
+#include "base/macros.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "gin/wrappable.h"
+
+
+namespace content {
+class RenderFrame;
+}
+
+// This class makes various helper functions available to the
+// error page loaded by NetErrorHelper.  It is bound to the JavaScript
+// window.errorPageController object.
+class NetErrorPageController

[jar (doing other things), 2014/04/21 23:48:19]

nit: Should this be in the net namespace?

[Randy Smith (Not in Mondays), 2014/04/22 20:40:02]

I followed the model of NetErrorHelper, which isn't.  That makes sense to me, as
we're nowhere near src/net, which is what I think of the net namespace as
meaning.

[mmenke, 2014/04/22 21:03:27]

You're correct - neither browser/net nor renderer/net should be in the net
namespace.

[jar (doing other things), 2014/04/23 01:52:01]

You're correct. This is not in the src/net/... path.... I didn't read the path
name well. Sorry.

I researched namespaces standards in Chromium (reading threads about it)... and
couldn't find a justification to land it anywhere specific... but the name,
starting with "NetError" sure seemed to confuse me.  Most other classes in this
directory (other than NetErrorHelper*) have names that don't resemble well know
libraries...

I'll get over it... and get used to it.  Sorry for the diversion.

+    : public gin::Wrappable<NetErrorPageController>,
+      public content::RenderFrameObserver {
+ public:
+  static gin::WrapperInfo kWrapperInfo;
+
+  static void Install(content::RenderFrame* render_frame);
+
+ private:
+  explicit NetErrorPageController(content::RenderFrame* render_frame);
+  virtual ~NetErrorPageController();
+
+  // Execute a "Load Stale" button click.
+  bool LoadStaleButtonClick();
+
+  // Execute a "Reload" button click.
+  bool ReloadButtonClick();
+
+  // Execute a "More" button click.
+  bool MoreButtonClick();
+
+  // gin::WrappableBase
+  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) OVERRIDE;
+
+  // RenderFrameObserver.  Overridden to avoid being destroyed when RenderFrame
+  // goes away; NetErrorPageController objects are owned by the JS
+  // garbage collector.
+  virtual void OnDestruct() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(NetErrorPageController);
+};
+
+#endif  // CHROME_RENDERER_NET_NET_ERROR_PAGE_CONTROLLER_H_