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

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

Index: chrome/browser/ui/views/tabs/tab_renderer_data.h
diff --git a/chrome/browser/ui/views/tabs/tab_renderer_data.h b/chrome/browser/ui/views/tabs/tab_renderer_data.h
index 829de7e559b9b2f8e44154e3c215ed6884297f0e..9b1d2ab9960f49c9dec03e106167af7a0e8f8c5b 100644
--- a/chrome/browser/ui/views/tabs/tab_renderer_data.h
+++ b/chrome/browser/ui/views/tabs/tab_renderer_data.h
@@ -20,6 +20,7 @@ struct CHROME_VIEWS_EXPORT TabRendererData {
     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();