Set the details field of the BROWSER_THEME_CHANGED notification to

chrome/browser/browser_theme_provider.h

 // 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_BROWSER_THEME_PROVIDER_H_
 #define CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 186 matching lines @@
   // Get the specified tint - |id| is one of the TINT_* enum values.
   color_utils::HSL GetTint(int id) const;
 
   // Clears all the override fields and saves the dictionary.
   virtual void ClearAllThemeData();
 
   // Load theme data from preferences.
   virtual void LoadThemePrefs();
 
   // Let all the browser views know that themes have changed.
-  virtual void NotifyThemeChanged();
+  // extension is NULL iff the theme is being set to the
+  // default/system theme.
+  virtual void NotifyThemeChanged(Extension* extension);
 
 #if defined(OS_MACOSX)
   // Let all the browser views know that themes have changed in a platform way.
   virtual void NotifyPlatformThemeChanged();
 #endif  // OS_MACOSX
 
   // Clears the platform-specific caches. Do not call directly; it's called
   // from ClearCaches().
   virtual void FreePlatformCaches();
 
@@ skipping 40 matching lines @@
 
   scoped_refptr<BrowserThemePack> theme_pack_;
 
   // The number of infobars currently displayed.
   int number_of_infobars_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserThemeProvider);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_THEME_PROVIDER_H_