Allow extensions on chrome:// URLs, when flag is set and permission is explicitly requested

chrome/common/extensions/manifest_tests/extension_manifests_chromepermission_unittest.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/common/extensions/manifest_tests/extension_manifest_test.h"
-
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/manifest.h"
+#include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace errors = extension_manifest_errors;
 
 TEST_F(ExtensionManifestTest, ChromeURLPermissionInvalid) {
   LoadAndExpectError("permission_chrome_url_invalid.json",
                      errors::kInvalidPermissionScheme);
 }
 
+TEST_F(ExtensionManifestTest, ChromeURLPermissionAllowedWithFlag) {
+  CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kExtensionsOnChromeURLs);
+  std::string error;
+  scoped_refptr<extensions::Extension> extension =
+    LoadAndExpectSuccess("permission_chrome_url_invalid.json");
+  EXPECT_EQ("", error);
+  const GURL newtab_url("chrome://newtab/");
+  EXPECT_TRUE(extension->CanExecuteScriptOnPage(newtab_url,
+                                                newtab_url,
+                                                0,
+                                                NULL,
+                                                &error)) << error;
+}
+
 TEST_F(ExtensionManifestTest, ChromeResourcesPermissionValidOnlyForComponents) {
   LoadAndExpectError("permission_chrome_resources_url.json",
                      errors::kInvalidPermissionScheme);
   std::string error;
   LoadExtension(Manifest("permission_chrome_resources_url.json"),
                 &error, extensions::Manifest::COMPONENT,
                 extensions::Extension::NO_FLAGS);
   EXPECT_EQ("", error);
 }