Display DNS probe results.

chrome/renderer/net/net_error_helper.h

 // Copyright (c) 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_RENDERER_NET_NET_ERROR_HELPER_H_
 #define CHROME_RENDERER_NET_NET_ERROR_HELPER_H_
 
 #include "chrome/common/net/net_error_info.h"
 #include "chrome/common/net/net_error_tracker.h"
 #include "content/public/renderer/render_view_observer.h"
+#include "googleurl/src/gurl.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebURLError.h"
+
+namespace base {
+class DictionaryValue;
+}
 
 namespace WebKit {
 class WebFrame;
 }
 
 class NetErrorHelper : public content::RenderViewObserver {
  public:
   explicit NetErrorHelper(content::RenderView* render_view);
   virtual ~NetErrorHelper();
 
   // RenderViewObserver implementation.
   virtual void DidStartProvisionalLoad(WebKit::WebFrame* frame) OVERRIDE;
   virtual void DidFailProvisionalLoad(
       WebKit::WebFrame* frame,
       const WebKit::WebURLError& error) OVERRIDE;
   virtual void DidCommitProvisionalLoad(
       WebKit::WebFrame* frame,
       bool is_new_navigation) OVERRIDE;
   virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE;
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
+  static bool GetErrorStringsForDnsProbe(
+      const WebKit::WebURLError& error,
+      base::DictionaryValue* strings,
+      const std::string& locale);
+
  private:
-  void OnNetErrorInfo(int dns_probe_result);
-  void TrackerCallback(NetErrorTracker::DnsErrorPageState state);
-  void UpdateErrorPage(chrome_common_net::DnsProbeResult dns_probe_result);
+  enum State {
+    IDLE,                  // Helper is not currently handling a DNS error
+    AWAITING_LOAD,         // Helper is waiting for error page load to finish
+    AWAITING_INITIAL_IPC,  // Helper is awaiting STARTED or NOT_RUN IPC
+    AWAITING_PROBE_RESULT  // Helper is awaiting FINISHED IPC to update page
+  };
+
+  void TrackerCallback(
+      NetErrorTracker::DnsErrorPageState state);
+  void OnNetErrorInfo(int status, int result);
+
+  void UpdateErrorPage();
+  WebKit::WebURLError MakeUpdatedError();
+
+  State state_;
+
+  WebKit::WebURLError last_error_;
+  chrome_common_net::DnsProbeStatus last_status_;
+  chrome_common_net::DnsProbeResult last_result_;
 
   NetErrorTracker tracker_;
-  NetErrorTracker::DnsErrorPageState dns_error_page_state_;
-  bool updated_error_page_;
 };
 
 #endif  // CHROME_RENDERER_NET_NET_ERROR_HELPER_H_