Introduce a //content/ API for dispatching notificationclick events.

content/content_common.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../gpu/command_buffer/command_buffer.gyp:gles2_utils',
     '../net/net.gyp:net',
@@ skipping 68 matching lines @@
       'public/common/media_stream_request.cc',
       'public/common/media_stream_request.h',
       'public/common/menu_item.cc',
       'public/common/menu_item.h',
       'public/common/page_state.cc',
       'public/common/page_state.h',
       'public/common/page_type.h',
       'public/common/page_zoom.h',
       'public/common/pepper_plugin_info.cc',
       'public/common/pepper_plugin_info.h',
+      'public/common/persistent_notification_status.h',
       'public/common/process_type.h',
       'public/common/push_messaging_status.cc',
       'public/common/push_messaging_status.h',
       'public/common/referrer.cc',
       'public/common/referrer.h',
       'public/common/renderer_preferences.cc',
       'public/common/renderer_preferences.h',
       'public/common/request_context_frame_type.h',
       'public/common/request_context_type.h',
       'public/common/resource_devtools_info.cc',
@@ skipping 827 matching lines @@
         'common/gpu/client/gpu_memory_buffer_impl_ozone.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.cc',
         'common/gpu/client/gpu_memory_buffer_impl_ozone_native_buffer.h',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h',
       ],
     }],
   ],
 }