Implement chrome://view-http-cache with network service.

content/network/cache_url_loader.h

Index: content/network/cache_url_loader.h
diff --git a/content/network/cache_url_loader.h b/content/network/cache_url_loader.h
new file mode 100644
index 0000000000000000000000000000000000000000..ff67acb9ea5987eb746e73689bc07c0bcb5cda88
--- /dev/null
+++ b/content/network/cache_url_loader.h
@@ -0,0 +1,22 @@
+// Copyright 2017 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.
+
+#ifndef CONTENT_NETWORK_CACHE_URL_LOADER_H_
+#define CONTENT_NETWORK_CACHE_URL_LOADER_H_
+
+#include "content/common/url_loader.mojom.h"
+
+namespace net {
+class URLRequestContext;
+}
+
+namespace content {
+
+// Creates a URLLoader that responds to developer requests to view the cache.
+void StartCacheURLLoader(const ResourceRequest& request,
+                         net::URLRequestContext* request_context,
+                         mojom::URLLoaderClientPtr client);
+}  // namespace content
+
+#endif  // CONTENT_NETWORK_CACHE_URL_LOADER_H_