Add flag in about:flags page to enable / disable apps-devtool.

chrome/browser/extensions/api/developer_private/developer_private_apitest.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 <map>
 
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
 
 using extensions::Extension;
 using extensions::Manifest;
 
 class DeveloperPrivateApiTest : public ExtensionApiTest {
  public:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionApiTest::SetUpCommandLine(command_line);
-    command_line->AppendSwitch(switches::kAppsDebugger);
+    command_line->AppendSwitch(switches::kAppsDevtool);
   }
 
   virtual void LoadExtensions() {
     base::FilePath base_dir = test_data_dir_.AppendASCII("developer");
     LoadNamedExtension(base_dir, "hosted_app");
   }
 
  protected:
   void LoadNamedExtension(const base::FilePath& path,
                           const std::string& name) {
@@ skipping 18 matching lines @@
   LoadExtensions();
 
   base::FilePath basedir = test_data_dir_.AppendASCII("developer");
   InstallNamedExtension(basedir, "packaged_app", Manifest::INTERNAL);
 
   InstallNamedExtension(basedir, "simple_extension", Manifest::INTERNAL);
 
   ASSERT_TRUE(RunExtensionSubtest(
       "developer/test", "basics.html", kFlagLoadAsComponent));
 }