Convert network hints to Mojo

components/network_hints/public/interfaces/network_hints.mojom

+// Copyright 2016 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.
+
+module network_hints.mojom;
+
+import "url/mojo/url.mojom";
+
+[Native]
+struct LookupRequest;
+
+// These are messages sent from the renderer process to the browser process.
+interface NetworkHints {
+  // Request for a DNS prefetch of the names in the array.
+  DNSPrefetch(LookupRequest request);
+
+  // Request for preconnect to host providing resource specified by URL.
+  Preconnect(
+      url.mojom.Url url,       // preconnect target url
+      bool allow_credentials,  // Does connection have its credentials flag set
+      int32 count);            // number of connections
+};