Fix randomly disappearing icons in app list recent view.

chrome/browser/ui/app_list/search/extension_app_result.h

 // Copyright 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_BROWSER_UI_APP_LIST_SEARCH_EXTENSION_APP_RESULT_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_EXTENSION_APP_RESULT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 33 matching lines @@
 
  private:
   void StartObservingExtensionRegistry();
   void StopObservingExtensionRegistry();
 
   // Checks if extension is disabled and if enable flow should be started.
   // Returns true if extension enable flow is started or there is already one
   // running.
   bool RunExtensionEnableFlow();
 
+  // Creates new icon in case icon does not exist or previous icon was
+  // invalidated.
+  void CreateOrUpdateIcon();
+
   // Updates the app item's icon, if necessary making it gray.
   void UpdateIcon();
 
   // extensions::IconImage::Observer overrides:
   void OnExtensionIconImageChanged(extensions::IconImage* image) override;
   void OnExtensionIconImageDestroyed(extensions::IconImage* image) override;
 
   // AppContextMenuDelegate overrides:
   void ExecuteLaunchCommand(int event_flags) override;
 
@@ skipping 12 matching lines @@
   std::unique_ptr<ExtensionEnableFlow> extension_enable_flow_;
 
   extensions::ExtensionRegistry* extension_registry_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionAppResult);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_EXTENSION_APP_RESULT_H_