Push API: use an enum to indicate status.

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 69 matching lines @@
       'public/common/page_state.cc',
       'public/common/page_state.h',
       'public/common/page_transition_types.cc',
       'public/common/page_transition_types.h',
       'public/common/page_transition_types_list.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/process_type.h',
+      'public/common/push_messaging_status.cc',
+      'public/common/push_messaging_status.h',
       'public/common/referrer.h',
       'public/common/renderer_preferences.cc',
       'public/common/renderer_preferences.h',
       'public/common/resource_devtools_info.cc',
       'public/common/resource_devtools_info.h',
       'public/common/resource_response.h',
       'public/common/resource_response_info.cc',
       'public/common/resource_response_info.h',
       'public/common/resource_type.cc',
       'public/common/resource_type.h',
@@ skipping 764 matching lines @@
     }, {
       'defines': ['USE_SECCOMP_BPF'],
     }],
     ['use_ozone==1', {
       'dependencies': [
         '../ui/ozone/ozone.gyp:ozone',
       ],
     }],
   ],
 }