Declarative resource hints go through mojo IPC to //content

third_party/WebKit/public/blink.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
             'platform/modules/background_sync/background_sync.mojom',
             'platform/modules/bluetooth/web_bluetooth.mojom',
             'platform/modules/geolocation/geolocation.mojom',
             'platform/modules/notifications/notification.mojom',
             'platform/modules/notifications/notification_service.mojom',
             'platform/modules/permissions/permission.mojom',
             'platform/modules/permissions/permission_status.mojom',
             'platform/modules/presentation/presentation.mojom',
             'platform/modules/serviceworker/service_worker_event_status.mojom',
             'platform/modules/wake_lock/wake_lock_service.mojom',
+            'platform/resource_hints.mojom',
         ],
         # Duplicated in GN: //third_party/WebKit/public:android_mojo_bindings
         'blink_android_mojo_sources': [
             'platform/modules/payments/payment_request.mojom',
         ],
     },
     'targets': [
         {
             # GN version: //third_party/WebKit/public:blink
             'target_name': 'blink',
@@ skipping 48 matching lines @@
         {
             # GN version: //third_party/WebKit/public:mojo_bindings_blink
             # (generated by //third_party/WebKit/public:mojo_bindings)
             'target_name': 'mojo_bindings_blink_mojom',
             'type': 'none',
             'variables': {
                 'mojom_files': [
                     '<@(blink_mojo_sources)',
                     '<@(blink_android_mojo_sources)',
                 ],
+                'mojom_typemaps': [
+                    '../Source/platform/mojo/KURL.typemap',
+                ],
                 'for_blink': 'true',
             },
             'includes': [
                 '../../../mojo/mojom_bindings_generator_explicit.gypi',
             ],
         },
         {
             # GN version: //third_party/WebKit/public:mojo_bindings
             'target_name': 'mojo_bindings_mojom',
             'type': 'none',
             'variables': {
                 'mojom_files': [
                     '<@(blink_mojo_sources)',
                     '<@(blink_android_mojo_sources)',
                 ],
+                'mojom_typemaps': [
+                    '../../../url/mojo/gurl.typemap',
+                ],
             },
             'includes': [
                 '../../../mojo/mojom_bindings_generator_explicit.gypi',
             ],
         },
         {
             # GN version: //third_party/WebKit/public:mojo_bindings
             'target_name': 'mojo_bindings',
             'type': 'static_library',
             'dependencies': [
@@ skipping 22 matching lines @@
                     'type': 'static_library',
                     'dependencies': [
                         'android_mojo_bindings_mojom',
                         '../../../mojo/mojo_public.gyp:mojo_bindings_java',
                     ],
                 },
             ],
         }],
     ],
 }