Fix for ERROR:url_pattern_set.cc(240)] Invalid url pattern: chrome://print/*

chrome/browser/extensions/test_extension_prefs.cc

 // Copyright (c) 2012 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/extensions/test_extension_prefs.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 158 matching lines @@
                                std::string());
   return extension;
 }
 
 std::string TestExtensionPrefs::AddExtensionAndReturnId(
     const std::string& name) {
   scoped_refptr<Extension> extension(AddExtension(name));
   return extension->id();
 }
 
+void TestExtensionPrefs::AddExtension(Extension* extension) {
+  prefs_->OnExtensionInstalled(extension,
+                               Extension::ENABLED,
+                               syncer::StringOrdinal::CreateInitialOrdinal(),
+                               std::string());
+}
+
 PrefService* TestExtensionPrefs::CreateIncognitoPrefService() const {
   return pref_service_->CreateIncognitoPrefService(
       new ExtensionPrefStore(extension_pref_value_map_.get(), true));
 }
 
 void TestExtensionPrefs::set_extensions_disabled(bool extensions_disabled) {
   extensions_disabled_ = extensions_disabled;
 }
 
 }  // namespace extensions