Site Settings Desktop: Implement Zoom Levels category.

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

Index: chrome/browser/ui/webui/settings/site_settings_handler.h
diff --git a/chrome/browser/ui/webui/settings/site_settings_handler.h b/chrome/browser/ui/webui/settings/site_settings_handler.h
index 753a08944582477c4b21933fa1a63ecb92f1c699..276057d75abcc07961494097ad3a70235182e51e 100644
--- a/chrome/browser/ui/webui/settings/site_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/site_settings_handler.h
@@ -11,6 +11,7 @@
 #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"
 
@@ -26,7 +27,7 @@ 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;
@@ -51,12 +52,16 @@ class SiteSettingsHandler : public SettingsPageUIHandler,
                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.
@@ -91,10 +96,23 @@ class SiteSettingsHandler : public SettingsPageUIHandler,
   // 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_;