Show Zoom Levels as content settings

content/public/browser/host_zoom_map.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 #define CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 31 matching lines @@
 
   // Structure used to notify about zoom changes. Host and/or scheme are empty
   // if not applicable to |mode|.
   struct ZoomLevelChange {
     ZoomLevelChangeMode mode;
     std::string host;
     std::string scheme;
     double zoom_level;
   };
 
+  typedef std::vector<ZoomLevelChange> ZoomLevelVector;
+
   CONTENT_EXPORT static HostZoomMap* GetForBrowserContext(
       BrowserContext* browser_context);
 
   // Copy the zoom levels from the given map. Can only be called on the UI
   // thread.
   virtual void CopyFrom(HostZoomMap* copy) = 0;
 
   // Here |host| is the host portion of URL, or (in the absence of a host)
   // the complete spec of the URL.
   // Returns the zoom for the specified |scheme| and |host|. See class
   // description for details.
   //
   // This may be called on any thread.
   virtual double GetZoomLevelForHostAndScheme(
       const std::string& scheme,
       const std::string& host) const = 0;
 
+  // Returns all non-temporary zoom levels. Can only be called on any thread.
+  virtual ZoomLevelVector GetAllZoomLevels() const = 0;
+
   // Here |host| is the host portion of URL, or (in the absence of a host)
   // the complete spec of the URL.
   // Sets the zoom level for the |host| to |level|.  If the level matches the
   // current default zoom level, the host is erased from the saved preferences;
   // otherwise the new value is written out.
   // Zoom levels specified for both scheme and host are not affected.
   //
   // This should only be called on the UI thread.
   virtual void SetZoomLevelForHost(const std::string& host, double level) = 0;
 
@@ skipping 19 matching lines @@
   virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
       const ZoomLevelChangedCallback& callback) = 0;
 
  protected:
   virtual ~HostZoomMap() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_HOST_ZOOM_MAP_H_