Add FrameHost mojo service

content/browser/host_zoom_map_impl.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_BROWSER_HOST_ZOOM_MAP_IMPL_H_
 #define CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_
 
 #include <map>
 #include <string>
 #include <tuple>
@@ skipping 131 matching lines @@
       zoom_level_changed_callbacks_;
 
   // Copy of the pref data, so that we can read it on the IO thread.
   HostZoomLevels host_zoom_levels_;
   SchemeHostZoomLevels scheme_host_zoom_levels_;
   double default_zoom_level_;
 
   // Page scale factor data for each renderer.
   ViewPageScaleFactorsAreOne view_page_scale_factors_are_one_;
 
-  // Don't expect more than a couple of tabs that are using a temporary zoom
-  // level, so vector is fine for now.
   TemporaryZoomLevels temporary_zoom_levels_;
 
   // Used around accesses to |host_zoom_levels_|, |default_zoom_level_|,
   // |temporary_zoom_levels_|, and |view_page_scale_factors_are_one_| to
   // guarantee thread safety.
   mutable base::Lock lock_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HostZoomMapImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_HOST_ZOOM_MAP_IMPL_H_