Add UMA for the new generic permisison class

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 318 matching lines @@
       'browser/content_settings/cookie_settings.cc',
       'browser/content_settings/cookie_settings.h',
       'browser/content_settings/host_content_settings_map.cc',
       'browser/content_settings/host_content_settings_map.h',
       'browser/content_settings/local_shared_objects_container.cc',
       'browser/content_settings/local_shared_objects_container.h',
       'browser/content_settings/permission_bubble_request_impl.cc',
       'browser/content_settings/permission_bubble_request_impl.h',
       'browser/content_settings/permission_context_base.cc',
       'browser/content_settings/permission_context_base.h',
+      'browser/content_settings/permission_context_uma_util.cc',
+      'browser/content_settings/permission_context_uma_util.h',
       'browser/content_settings/permission_infobar_delegate.cc',
       'browser/content_settings/permission_infobar_delegate.h',
       'browser/content_settings/permission_queue_controller.cc',
       'browser/content_settings/permission_queue_controller.h',
       'browser/content_settings/permission_request_id.cc',
       'browser/content_settings/permission_request_id.h',
       'browser/content_settings/tab_specific_content_settings.cc',
       'browser/content_settings/tab_specific_content_settings.h',
       'browser/crash_upload_list.cc',
       'browser/crash_upload_list.h',
@@ skipping 3243 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }