Updating histograms to allow for experiments & log origin-based histograms.

chrome/browser/prerender/prerender_contents.h

 // Copyright (c) 2011 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 CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 43 matching lines @@
     virtual ~Factory() {}
 
     // Ownership is not transfered through this interface as prerender_manager,
     // prerender_tracker, and profile are stored as weak pointers.
     virtual PrerenderContents* CreatePrerenderContents(
         PrerenderManager* prerender_manager,
         PrerenderTracker* prerender_tracker,
         Profile* profile,
         const GURL& url,
         const GURL& referrer,
-        Origin origin) = 0;
+        Origin origin,
+        char experiment_id) = 0;

[dominich, 2011/06/30 18:11:15]

A uint8 would be more appropriate than a char. This suggests it might be 'A' or
'B' for example. A uint8 makes it clear it's an integer.

[tburkard, 2011/06/30 19:45:48]

Done.

 
    private:
     DISALLOW_COPY_AND_ASSIGN(Factory);
   };
 
   virtual ~PrerenderContents();
 
   bool Init();
 
   static Factory* CreateFactory();
@@ skipping 89 matching lines @@
   int32 starting_page_id() { return starting_page_id_; }
 
   Value* GetAsValue() const;
 
  protected:
   PrerenderContents(PrerenderManager* prerender_manager,
                     PrerenderTracker* prerender_tracker,
                     Profile* profile,
                     const GURL& url,
                     const GURL& referrer,
-                    Origin origin);
+                    Origin origin,
+                    char experiment_id);
 
   NotificationRegistrar& notification_registrar() {
     return notification_registrar_;
   }
 
   // Called whenever a RenderViewHost is created for prerendering.  Only called
   // once the RenderViewHost has a RenderView and RenderWidgetHostView.
   virtual void OnRenderViewHostCreated(RenderViewHost* new_render_view_host);
 
  private:
@@ skipping 85 matching lines @@
   // These are -1 before a RenderView is created.
   int child_id_;
   int route_id_;
 
   // Page ID at which prerendering started.
   int32 starting_page_id_;
 
   // Origin for this prerender.
   Origin origin_;
 
+  // Experiment during which this prerender is performed.
+  char experiment_id_;
+
   // Offset by which to offset prerendered pages
   static const int32 kPrerenderPageIdOffset = 10;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_