Changes to content/ to facilitate new zoom extension API

content/browser/host_zoom_map_impl.h

Index: content/browser/host_zoom_map_impl.h
diff --git a/content/browser/host_zoom_map_impl.h b/content/browser/host_zoom_map_impl.h
index 155f18e00fb2babd091a352d5df7b2b6974982ce..4f7c5d24cdbc3054cf39012d37f0afcc869d5b8d 100644
--- a/content/browser/host_zoom_map_impl.h
+++ b/content/browser/host_zoom_map_impl.h
@@ -46,6 +46,10 @@ class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
   virtual scoped_ptr<Subscription> AddZoomLevelChangedCallback(
       const ZoomLevelChangedCallback& callback) OVERRIDE;
 
+  // Stores a callback to be called when the associated zoom change has
+  // completed.
+  void AddZoomCallback(int zoom_id, const base::Callback<void(void)>& callback);
+
   // Returns the temporary zoom level that's only valid for the lifetime of
   // the given WebContents (i.e. isn't saved and doesn't affect other
   // WebContentses) if it exists, the default zoom level otherwise.
@@ -54,22 +58,46 @@ class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
   double GetTemporaryZoomLevel(int render_process_id,
                                int render_view_id) const;
 
+  // Additionally calls the callback associated with the zoom ID |zoom_id|.
+  virtual void SetZoomLevelForHost(
+      const std::string& host,
+      int zoom_id,
+      double level);
+
   // Sets the temporary zoom level that's only valid for the lifetime of this
   // WebContents.
   //
   // This should only be called on the UI thread.
   void SetTemporaryZoomLevel(int render_process_id,
                              int render_view_id,
+                             const std::string& host,
+                             int zoom_id,
                              double level);
 
+  // Erases the temporary zoom level stored for a WebContents.
+  //
+  // This should only be called on the UI thread.
+  void EraseTemporaryZoomLevel(int render_process_id, int render_view_id);
+
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
 
  private:
+  // Called when the zoom change with ID |zoom_id| has completed, and its
+  // associated callback should be called. Each callback can only be called
+  // once, and is removed from the |zoom_callback_map_| after calling.
+  void CallZoomCallback(int zoom_id);
+
   double GetZoomLevelForHost(const std::string& host) const;
 
+  // Notifies the renderers from this browser context to change the zoom level
+  // for the specified host and scheme.
+  void SendZoomLevelChange(const std::string& scheme,
+                           const std::string& host,
+                           double level);
+
   typedef std::map<std::string, double> HostZoomLevels;
   typedef std::map<std::string, HostZoomLevels> SchemeHostZoomLevels;
 
@@ -92,6 +120,9 @@ class CONTENT_EXPORT HostZoomMapImpl : public NON_EXPORTED_BASE(HostZoomMap),
   // level, so vector is fine for now.
   std::vector<TemporaryZoomLevel> temporary_zoom_levels_;
 
+  // Stores callbacks to be called when the associated zoom changes complete.
+  std::map<int, base::Callback<void(void)> > zoom_callback_map_;
+
   // Used around accesses to |host_zoom_levels_|, |default_zoom_level_| and
   // |temporary_zoom_levels_| to guarantee thread safety.
   mutable base::Lock lock_;