Changes to content/ to facilitate new zoom extension API

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 930769721106ec55a76d22f33a5682f68a1cdb3c..694fe47079875d897817cae379ebadeb0e660d24 100644
--- a/content/public/browser/host_zoom_map.h
+++ b/content/public/browser/host_zoom_map.h
@@ -47,6 +47,7 @@ class HostZoomMap {
     std::string host;
     std::string scheme;
     double zoom_level;
+    int zoom_id;
   };
 
   typedef std::vector<ZoomLevelChange> ZoomLevelVector;
@@ -79,7 +80,8 @@ class HostZoomMap {
   // 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;
+  virtual void SetZoomLevelForHost(const std::string& host,
+                                   double level) = 0;
 
   // Here |host| is the host portion of URL, or (in the absence of a host)
   // the complete spec of the URL.