Add scheme to HostZoomMap

content/public/browser/host_zoom_map.h

Index: content/public/browser/host_zoom_map.h
diff --git a/content/public/browser/host_zoom_map.h b/content/public/browser/host_zoom_map.h
index 1e32e79383702721f3128efef30a2e0fff8f82eb..1e356227f61025a0bd5a7455010073b913a2e092 100644
--- a/content/public/browser/host_zoom_map.h
+++ b/content/public/browser/host_zoom_map.h
@@ -29,22 +29,31 @@ class HostZoomMap {
   // thread.
   virtual void CopyFrom(HostZoomMap* copy) = 0;
 
-  // Returns the zoom level for the host or spec for a given url. The zoom
-  // level is determined by the host portion of the URL, or (in the absence of
-  // a host) the complete spec of the URL. In most cases, there is no custom
-  // zoom level, and this returns the user's default zoom level.  Otherwise,
-  // returns the saved zoom level, which may be positive (to zoom in) or
-  // negative (to zoom out).
+  // Returns the zoom level for the host or spec for a given url, taking
+  // |scheme| in account. If |scheme| is specified and there is specific zoom
+  // level specified for given |scheme| and |host| pair, it will be returned.
+  // In other cases the zoom level is determined by the host portion of the URL,
+  // or (in the absence of a host) the complete spec of the URL. In most cases,
+  // there is no custom  zoom level, and this returns the user's default zoom
+  // level.  Otherwise, returns the saved zoom level, which may be positive
+  // (to zoom in) or negative (to zoom out).
   //
   // This may be called on any thread.
-  virtual double GetZoomLevel(const std::string& host) const = 0;
+  virtual double GetZoomLevel(const std::string& scheme,
+                              const std::string& host) const = 0;
 
-  // Sets the zoom level for the host or spec for a given url 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.
+  // Sets the zoom level for the |scheme|/|host| pair to |level|. If |scheme|
+  // is not specified, sets the zoom level for the host or spec for a given url
+  // 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.
+  //
+  // Only values without specified scheme will be stored in preferences.
   //
   // This should only be called on the UI thread.
-  virtual void SetZoomLevel(const std::string& host, double level) = 0;
+  virtual void SetZoomLevel(const std::string& scheme,
+                            const std::string& host,
+                            double level) = 0;
 
   // Get/Set the default zoom level for pages that don't override it.
   virtual double GetDefaultZoomLevel() const = 0;