Replace __MSG_some_name__ template within extension css/html files with local...

chrome/common/filter_policy.h

 // Copyright (c) 2006-2008 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_COMMON_FILTER_POLICY_H__
 #define CHROME_COMMON_FILTER_POLICY_H__
 
 #include "base/basictypes.h"
 
 // When an insecure resource (mixed content or bad HTTPS) is loaded, the browser
 // can decide to filter it.  The filtering is done in the renderer.  This class
 // enumerates the different policy that can be used for the filtering.  It is
 // passed along with resource response messages.
+// It can be used for content post-processing, like message replacement within
+// extension css files.
 class FilterPolicy {
  public:
   enum Type {
     // Pass all types of resources through unmodified.
     DONT_FILTER = 0,
 
+    // Post-process extension css files.
+    FILTER_EXTENSION_MESSAGES,
+
     // Block all types of resources, except images.  For images, modify them to
     // indicate that they have been filtered.
     // TODO(abarth): This is a misleading name for this enum value.  We should
     //               change it to something more suggestive of what this
     //               actually does.
     FILTER_ALL_EXCEPT_IMAGES,
 
     // Block all types of resources.
     FILTER_ALL
   };
 
   static bool ValidType(int32 type) {
     return type >= DONT_FILTER && type <= FILTER_ALL;
   }
 
   static Type FromInt(int32 type) {
     return static_cast<Type>(type);
   }
 
  private:
   // Don't instantiate this class.
   FilterPolicy();
   ~FilterPolicy();
 
 };
 
 #endif  // CHROME_COMMON_FILTER_POLICY_H__