Implement important sites dialog for desktop.

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h

Index: chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h
diff --git a/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h b/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h
index 6137c84bcd618fa5c0df63b042b03def58b2e737..fab18a39f62048fc5b4b92b353c7c9d667f5e992 100644
--- a/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h
+++ b/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h
@@ -21,6 +21,7 @@ class ListValue;
 }
 
 namespace content {
+class BrowsingDataFilterBuilder;
 class WebUI;
 }
 
@@ -39,17 +40,21 @@ class ClearBrowsingDataHandler : public SettingsPageUIHandler,
   void OnJavascriptDisallowed() override;
 
  private:
-  // Observes one |remover| task initiated from ClearBrowsingDataHandler.
-  // Calls |callback| when the task is finished.
-  class TaskObserver;
-
   // Clears browsing data, called by Javascript.
   void HandleClearBrowsingData(const base::ListValue* value);
 
+  // Parses a ListValue with important site information and creates a
+  // BrowsingDataFilterBuilder.
+  std::unique_ptr<content::BrowsingDataFilterBuilder> ProcessImportantSites(
+      const base::ListValue* important_sites);
+
   // Called when a clearing task finished. |webui_callback_id| is provided
   // by the WebUI action that initiated it.
   void OnClearingTaskFinished(const std::string& webui_callback_id);
 
+  // Fetches important sites, called by Javascript.
+  void HandleFetchImportantSites(const base::ListValue* value);
+
   // Initializes the dialog UI. Called by JavaScript when the DOM is ready.
   void HandleInitialize(const base::ListValue* args);
 
@@ -85,9 +90,6 @@ class ClearBrowsingDataHandler : public SettingsPageUIHandler,
   // Counters that calculate the data volume for individual data types.
   std::vector<std::unique_ptr<browsing_data::BrowsingDataCounter>> counters_;
 
-  // Observes the currently active data clearing task.
-  std::unique_ptr<TaskObserver> task_observer_;
-
   // ProfileSyncService to observe sync state changes.
   browser_sync::ProfileSyncService* sync_service_;
   ScopedObserver<browser_sync::ProfileSyncService, syncer::SyncServiceObserver>
@@ -103,6 +105,8 @@ class ClearBrowsingDataHandler : public SettingsPageUIHandler,
   bool show_history_deletion_dialog_;
 
   // A weak pointer factory for asynchronous calls referencing this class.
+  // The weak pointers are invalidated in |OnJavascriptDisallowed()| and
+  // |HandleInitialize()| to cancel previously initiated tasks.
   base::WeakPtrFactory<ClearBrowsingDataHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowsingDataHandler);