Disable chrome://options UI elements if the corresponding preference is not user-modifiable.

chrome/browser/ui/webui/options/core_options_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/options/core_options_handler.h"
 
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
@@ skipping 123 matching lines @@
   PrefService* pref_service = web_ui_->GetProfile()->GetPrefs();
 
   const PrefService::Preference* pref =
       pref_service->FindPreference(pref_name.c_str());
 
   Value* return_value;
   if (pref) {
     DictionaryValue* dict = new DictionaryValue;
     dict->Set("value", pref->GetValue()->DeepCopy());
     dict->SetBoolean("managed", pref->IsManaged());
+    dict->SetBoolean("extensionControlled", pref->IsExtensionControlled());
+    dict->SetBoolean("disabled", !pref->IsUserModifiable());
     return_value = dict;
   } else {
     return_value = Value::CreateNullValue();
   }
   return return_value;
 }
 
 void CoreOptionsHandler::ObservePref(const std::string& pref_name) {
   registrar_.Add(pref_name.c_str(), this);
 }
@@ skipping 216 matching lines @@
     for (PreferenceCallbackMap::const_iterator iter =
         pref_callback_map_.find(*pref_name);
         iter != pref_callback_map_.end(); ++iter) {
       const std::wstring& callback_function = iter->second;
       ListValue result_value;
       result_value.Append(Value::CreateStringValue(pref_name->c_str()));
 
       DictionaryValue* dict = new DictionaryValue;
       dict->Set("value", pref->GetValue()->DeepCopy());
       dict->SetBoolean("managed", pref->IsManaged());
+      dict->SetBoolean("extensionControlled", pref->IsExtensionControlled());
+      dict->SetBoolean("disabled", !pref->IsUserModifiable());
       result_value.Append(dict);
 
       web_ui_->CallJavascriptFunction(WideToASCII(callback_function),
                                       result_value);
     }
   }
 }