Adding URLResponse Disk Cache to mojo.

services/service_cache/service_cache_entry.mojom

Index: services/service_cache/service_cache_entry.mojom
diff --git a/services/icu_data/icu_data.mojom b/services/service_cache/service_cache_entry.mojom
similarity index 53%
copy from services/icu_data/icu_data.mojom
copy to services/service_cache/service_cache_entry.mojom
index 53f8ac5d047091be7948d9d587bcb090fa33cab6..960c57f12d0e764d7d14d8dad85ec517e2599596 100644
--- a/services/icu_data/icu_data.mojom
+++ b/services/service_cache/service_cache_entry.mojom
@@ -2,8 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module icu_data;
+module mojo.service_cache;
 
-interface ICUData {
-  Map(string sha1hash) => (handle<shared_buffer>? icu_data);
+// One entry in the service cache.
+struct CacheEntry {
+  string url;
+  string content_path;
+  array<string>? headers;
 };