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diff --git a/chrome/browser/extensions/extension_process_manager.h b/chrome/browser/extensions/extension_process_manager.h
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+++ b/chrome/browser/extensions/extension_process_manager.h
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+// Copyright (c) 2009 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_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
+
+#include "base/ref_counted.h"
+
+#include <map>
+
+class BrowsingInstance;
+class Extension;
+class ExtensionView;
+class GURL;
+class Profile;
+class SiteInstance;
+
+// This class controls what process new extension instances use.  We use the
+// BrowsingInstance site grouping rules to group extensions.  Since all
+// resources in a given extension have the same origin, they will be grouped
+// into the same process.
+//
+// We separate further by Profile: each Profile has its own group of extension
+// processes that never overlap with other Profiles.
+class ExtensionProcessManager {
+ public:
+  static ExtensionProcessManager* GetInstance();
+
+  // These are public for use by Singleton.  Do not instantiate or delete
+  // manually.
+  ExtensionProcessManager();
+  ~ExtensionProcessManager();
+
+  // Creates a new ExtensionView, grouping it in the appropriate SiteInstance
+  // (and therefore process) based on the URL and profile.
+  ExtensionView* CreateView(Extension* extension,
+                            const GURL& url,
+                            Profile* profile);
+
+  // Returns the SiteInstance that the given URL belongs to in this profile.
+  SiteInstance* GetSiteInstanceForURL(const GURL& url, Profile* profile);
+ private:
+  // Returns our BrowsingInstance for the given profile.  Lazily created and
+  // cached.
+  BrowsingInstance* GetBrowsingInstance(Profile* profile);
+
+  // Cache of BrowsingInstances grouped by Profile.
+  typedef std::map<Profile*, scoped_refptr<BrowsingInstance> >
+      BrowsingInstanceMap;
+  BrowsingInstanceMap browsing_instance_map_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_