[DRP] Consistently use LoFi for an entire page

components/data_reduction_proxy/core/common/lofi_decider.h

+// 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.
+
+#ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_LOFI_DECIDER_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_LOFI_DECIDER_H_
+
+#include "base/macros.h"
+#include "net/url_request/url_request.h"
+
+namespace data_reduction_proxy {
+
+// Interface to determine if a request should be made for a low fidelity version
+// of the resource.
+class LoFiDecider {
+ public:
+  virtual ~LoFiDecider() {}
+
+  // Returns true when Lo-Fi mode is on for the given |request|. This means the
+  // Lo-Fi header should be added to the given request, unless the user is in
+  // in the Lo-Fi control group.
+  virtual bool IsUsingLoFiMode(const net::URLRequest& request) const = 0;
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_LOFI_DECIDER_H_