Adding URLResponse Disk Cache to mojo.

mojo/services/url_response_disk_cache/public/interfaces/url_response_disk_cache.mojom

Index: mojo/services/url_response_disk_cache/public/interfaces/url_response_disk_cache.mojom
diff --git a/mojo/services/url_response_disk_cache/public/interfaces/url_response_disk_cache.mojom b/mojo/services/url_response_disk_cache/public/interfaces/url_response_disk_cache.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..889101bf96e070b86e2e45ae08cf32d4b763e280
--- /dev/null
+++ b/mojo/services/url_response_disk_cache/public/interfaces/url_response_disk_cache.mojom
@@ -0,0 +1,35 @@
+// 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.
+
+module mojo.url_response_disk_cache;
+
+import "mojo/services/network/public/interfaces/url_loader.mojom";
+
+// This service allows client to efficiently cache and retrieve url response
+// content on disk. In particular, it allows the shell and content handlers to
+// efficiently cache and retrieve mojo applications.
+// TODO(qsr): At the moment, the url response disk cache only handles ETag. If
+//            either the cached version of the given response do not contain

[blundell, 2015/05/07 13:57:59]

nit: s/of/or

[qsr, 2015/05/07 14:18:07]

Done.

+//            ETags, the entry will be invalidated. It should be extended to
+//            handle all the other http cache mechanisms for better performance
+//            with http servers that do not support ETags.
+interface URLResponseDiskCache {
+
+   // Given a URLResponse, returns a pair of paths. |file_path| is a file
+   // containing the body of the response. |cache_dir_path| is a directory that
+   // the applicaton can use to store content. This service guarantee that
+   // |cache_dir_path| will be emptied when |file_path| content changes. For
+   // example, a content handler that is backed by a VM that compiles files
+   // could have the VM use this directory to cache the compiled files.
+   GetFile(mojo.URLResponse response) =>
+       (array<uint8>? file_path, array<uint8>? cache_dir_path);
+
+   // Given a URLResponse that is expected to have a zipped body, returns a
+   // pair of paths. |extracted_dir_path| is a directory containing the unzipped
+   // body of the response. |cache_dir_path| is a directory that the applicaton
+   // can use to store content. This service guarantee that |cache_dir_path|
+   // will be emptied when |extracted_dir_path| content changes.
+   GetExtractedContent(mojo.URLResponse response) =>
+       (array<uint8>? extracted_dir_path, array<uint8>? cache_dir_path);
+};