Implement BackgroundFetchManager.fetch() and struct traits

content/common/BUILD.gn

 # Copyright 2014 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.
 
 import("features.gni")
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 44 matching lines @@
     "android/sync_compositor_statics.h",
     "appcache_interfaces.cc",
     "appcache_interfaces.h",
     "appcache_messages.h",
     "associated_interface_provider_impl.cc",
     "associated_interface_provider_impl.h",
     "associated_interface_registry_impl.cc",
     "associated_interface_registry_impl.h",
     "ax_content_node_data.cc",
     "ax_content_node_data.h",
+    "background_fetch/background_fetch_struct_traits.cc",
+    "background_fetch/background_fetch_struct_traits.h",
+    "background_fetch/background_fetch_types.cc",
+    "background_fetch/background_fetch_types.h",
     "bluetooth/web_bluetooth_device_id.cc",
     "bluetooth/web_bluetooth_device_id.h",
     "browser_plugin/browser_plugin_constants.cc",
     "browser_plugin/browser_plugin_constants.h",
     "browser_plugin/browser_plugin_messages.h",
     "cache_storage/cache_storage_messages.h",
     "cache_storage/cache_storage_types.cc",
     "cache_storage/cache_storage_types.h",
     "child_process_host_impl.cc",
     "child_process_host_impl.h",
@@ skipping 560 matching lines @@
     "//url/mojo:url_mojom_origin",
   ]
 
   overridden_deps = [ "//ipc:mojom" ]
   component_deps = [ "//ipc" ]
 
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }