Site Settings Desktop: Implement Zoom Levels category.

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

 // Copyright 2016 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_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_
 
 #include <vector>
 
 #include "base/scoped_observer.h"
 #include "chrome/browser/storage/storage_info_fetcher.h"
 #include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
+#include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class HostContentSettingsMap;
 class Profile;
 
 namespace base {
 class ListValue;
 }
 
 namespace settings {
 
 // Chrome "ContentSettings" settings page UI handler.
 class SiteSettingsHandler : public SettingsPageUIHandler,
                             public content_settings::Observer,
-                            public content::NotificationObserver  {
+                            public content::NotificationObserver {
  public:
   explicit SiteSettingsHandler(Profile* profile);
   ~SiteSettingsHandler() override;
 
   // SettingsPageUIHandler:
   void RegisterMessages() override;
   void OnJavascriptAllowed() override;
   void OnJavascriptDisallowed() override;
 
   // Usage info.
   void OnGetUsageInfo(const storage::UsageInfoEntries& entries);
   void OnUsageInfoCleared(storage::QuotaStatusCode code);
 
   // content_settings::Observer:
   void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
                                const ContentSettingsPattern& secondary_pattern,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
 
   // content::NotificationObserver:
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // content::HostZoomMap subscription.
+  void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change);
+
  private:
   friend class SiteSettingsHandlerTest;
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, GetAndSetDefault);
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Origins);
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Patterns);
   FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, Incognito);
+  FRIEND_TEST_ALL_PREFIXES(SiteSettingsHandlerTest, ZoomLevels);
 
   // Asynchronously fetches the usage for a given origin. Replies back with
   // OnGetUsageInfo above.
   void HandleFetchUsageTotal(const base::ListValue* args);
 
   // Deletes the storage being used for a given host.
   void HandleClearUsage(const base::ListValue* args);
 
   // Handles the request for a list of all USB devices.
   void HandleFetchUsbDevices(const base::ListValue* args);
@@ skipping 14 matching lines @@
 
   // Returns whether a given pattern is valid.
   void HandleIsPatternValid(const base::ListValue* args);
 
   // Looks up whether an incognito session is active.
   void HandleUpdateIncognitoStatus(const base::ListValue* args);
 
   // Notifies the JS side whether incognito is enabled.
   void SendIncognitoStatus(Profile* profile, bool was_destroyed);
 
+  // Handles the request for a list of all zoom levels.
+  void HandleFetchZoomLevels(const base::ListValue* args);
+
+  // Sends the zoom level list down to the web ui.
+  void SendZoomLevels();
+
+  // Removes a particular zoom level for a given host.
+  void HandleRemoveZoomLevel(const base::ListValue* args);
+
   Profile* profile_;
 
   content::NotificationRegistrar notification_registrar_;
 
+  // Keeps track of events related to zooming.
+  std::unique_ptr<content::HostZoomMap::Subscription>
+      host_zoom_map_subscription_;
+
   // The host for which to fetch usage.
   std::string usage_host_;
 
   // The origin for which to clear usage.
   std::string clearing_origin_;
 
   // Change observer for content settings.
   ScopedObserver<HostContentSettingsMap, content_settings::Observer> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteSettingsHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SITE_SETTINGS_HANDLER_H_