Desaturate the favicon shown in the tab when a network error is encountered

chrome/browser/ui/views/tabs/tab_renderer_data.h

 // Copyright (c) 2012 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_UI_VIEWS_TABS_TAB_RENDERER_DATA_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_RENDERER_DATA_H_
 
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/tabs/tab_utils.h"
 #include "chrome/browser/ui/views/chrome_views_export.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
 
 // Wraps the state needed by the renderers.
 struct CHROME_VIEWS_EXPORT TabRendererData {
   // Different types of network activity for a tab. The NetworkState of a tab
   // may be used to alter the UI (e.g. show different kinds of loading
   // animations).
   enum NetworkState {
     NETWORK_STATE_NONE,     // no network activity.
     NETWORK_STATE_WAITING,  // waiting for a connection.
     NETWORK_STATE_LOADING,  // connected, transferring data.
+    NETWORK_STATE_ERROR,    // Encountered a network error.
   };
 
   TabRendererData();
   TabRendererData(const TabRendererData& other);
   ~TabRendererData();
 
   // This interprets the crashed status to decide whether or not this
   // render data represents a tab that is "crashed" (i.e. the render
   // process died unexpectedly).
   bool IsCrashed() const;
 
   // Returns true if the TabRendererData is same as given |data|.
   bool Equals(const TabRendererData& data);
 
   gfx::ImageSkia favicon;
   NetworkState network_state;
   base::string16 title;
   GURL url;
   bool loading;
   base::TerminationStatus crashed_status;
   bool incognito;
   bool show_icon;
   bool pinned;
   bool blocked;
   bool app;
   TabAlertState alert_state;
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_RENDERER_DATA_H_