Upstream the Media Router's Issue class.

chrome/browser/media/router/media_router.gyp

 # Copyright 2015 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.
 
 {
   'targets': [
     {
       'target_name': 'media_router',
       'type': 'static_library',
       'include_dirs': [
         '<(DEPTH)',
       ],
       'dependencies': [
         ':media_router_mojo',
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/url/url.gyp:url_lib',
       ],
       'sources': [
+        'issue.cc',
+        'issue.h',
+        'issue_manager.cc',
+        'issue_manager.h',
+        'issue_observer.h',
         'media_route.cc',
         'media_route.h',
         'media_route_id.h',
         'media_router.h',
         'media_router_impl.cc',
         'media_router_impl.h',
         'media_router_impl_factory.cc',
         'media_router_impl_factory.h',
         'media_routes_observer.cc',
         'media_routes_observer.h',
@@ skipping 32 matching lines @@
         '<(DEPTH)/mojo/mojo_base.gyp:mojo_environment_chromium',
         '<(DEPTH)/third_party/mojo/mojo_public.gyp:mojo_cpp_bindings',
       ],
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/media/router/media_router.mojom.cc',
         '<(SHARED_INTERMEDIATE_DIR)/chrome/browser/media/router/media_router.mojom.h',
       ],
     },
   ],
 }