Enable (optional) blocking of webrequests in case a PAC script cannot be fetched or is invalid.

chrome/browser/extensions/extension_preference_api.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_EXTENSIONS_EXTENSION_PREFERENCE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__
 #pragma once
 
 #include <string>
 
@@ skipping 32 matching lines @@
 
 class PrefTransformerInterface {
  public:
   virtual ~PrefTransformerInterface() {}
 
   // Converts the representation of a preference as seen by the extension
   // into a representation that is used in the pref stores of the browser.
   // Returns the pref store representation in case of success or sets
   // |error| and returns NULL otherwise.
   // The ownership of the returned value is passed to the caller.
+  // TODO(battre): add bool* bad_message to allow terminating the entire
+  // extension in order to simulate the behavior of EXTENSION_FUNCTION_VALIDATE.
   virtual Value* ExtensionToBrowserPref(const Value* extension_pref,
                                         std::string* error) = 0;
 
   // Converts the representation of the preference as stored in the browser
   // into a representation that is used by the extension.
   // Returns the extension representation in case of success or NULL otherwise.
   // The ownership of the returned value is passed to the caller.
   virtual Value* BrowserToExtensionPref(const Value* browser_pref) = 0;
 };
 
@@ skipping 12 matching lines @@
 };
 
 class ClearPreferenceFunction : public SyncExtensionFunction {
  public:
   virtual ~ClearPreferenceFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.preferences.clear")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__